I would argue that a character with bone lacing, wired reflexes, and dermal armor is a "street samurai", but that is really just semantics. Because this is not a class system but a build system, I am not really sure what point you are trying to make. I basically read your statement as "A street sam does not resist damage better than any other type of PC who bought the same stuff to resist damage".
The key here is to recognize the bone lacing and dermal armor as redundant. Like it doesn't improve your outcomes anymore than full body armor does.
Well... it does. Just not meaningfully.
Like lets say your being attacked by a Sioux Wildcat. They can't use grenades because argle bargle, foofaraw, hey diddy hoe diddy no one knows.
Actually no, its a hostage situation or your in a lab or whatever.
You got two PCs out of gen: Identical in every way save one has bone lacing and bone density for 2 extra soak, and your body is 2 higher, the other doesn't cuz they got nerd crud like... tailored pheromones or a datajack or the like. You both got 6 athletics. Intuition is kinda a really good attribute for deckers and faces so they got 5, just like you. You got 1 more base reaction because, hey, why not, and have 5 base, while they have 4. You both have wired 3, cuz you wanted two majors and a spare minor and to be frank it is so ridiculously a good breakpoint for 'wired it is gunna be bigger than taking 2 levels of monk in D&D 3.5, its all the rage, everyone who is anyone is doing it. You also both have an athletics reflex recorder because gosh darn if that little bit of nerve clusters still isn't one of the most insane deals in the game.
Also, you got dermal plating. It doesn't help you cuz your already generating max edge. While it is funny to just not wear any armor, just buy an armored jacket and save your essence if you REALLY gotta.
This is the most favorable grunt to go up against. Your nominal advantage vs this face gets smaller against lower skill opponents. You mostly will fight like... corpsec mind, but lets look at the ideal case scenario, the 'build around.'
You, the swole Samurai, take 0 DV after this attack 56% of the time. The average damage you take is 2.34, but when hit you will usually take 5-6 damage. You take 8+ DV around 3% of the time, and will go down in statistically about 3-4 attacks.
The stupid nerd who just took the wired reflexes takes 0 DV 47% of the time. A difference of about 10%, meaning around 1 in 10 attacks will hit them for their lowered reaction in this scenario that wouldn't hit you. Their average damage taken per attack is 3.43 and they take an average of 5-6 damage, just like you, per attack. Their damage trends upwards slightly higher, 6% of the time they take 8+ damage in a single attack, but they ALSO go down in 3-4 hits, and they don't meaningfully lean more towards 3 than you do, that 3-4 mostly comes from miss rate, which is nearly identical for you two. If you were willing to spend edge, it becomes more so, both your expected TTKs pretty much jump to eating 5 attacks lock step.
Vs weaker enemies rolling less dice, like something weak... lets say... a Red Samurai, those chumps, attacks do 0DV to you 75% of the time and 0 DV to the nerd about 66% of the time. Again, a gain of about 10%, or 1 in 10 attacks. Takes about 5 attacks to down them, about 5 to down you. Basic corpsec? Your miss rate differs by 1%, your both dodging over 95% of the time, the nerd at 96%, you at 97%, your average damage is crazy low, you take .009, they take .018, which is technically 'half' what they take but like what is the difference in dying after being attacked 10,000 times rather than 5,000?
That is the problem with really flat defenses where the biggest game changer is hit vs not hit: The outcomes are mostly the same and are mostly dictated by 'can I get a second major' which means if you ever intend to fight at all you will do a lot to get the second major, and in doing so your outcomes pretty much become identical in most circumstances to the guy who went all in on it. Like, yeah again the samurai technically took 1 less attack out of 10 vs the really elite folks, but that isn't going to realistically be a difference maker in most fights because your TTKS are so identical the shooting basically has to IMMEDIATELY stop after the face or decker gets 'unlucky' and falls prey to their inferior statistics. Neither PCs are likely at all to go down in one hit, the odds of that 'lucky shot' are basically identical, so the outcome really doesn't change outside of a super specific scenario. You aren't even dealing with a lot of variance, both PCs are pretty darn stable at resisting damage.
This is a problem SPECIFICALLY in the context of the concept of the samurai. I don't mind faces being tough, I think 5e handled that well by making it easy to not die instantly in a gunfight but really hard to become bullet immune. The issue is when there is no gap in performance for samurai defensively, and they haven't gained meaningful combat utility, the entire point of a samurai gets eroded. The math of this edition REALLY doesn't favor combat investments beyond wired 3 and a reflex recorder, and that basically means that dedicated combat PCs don't... make sense. You basically always are better off playing a face who also has wired 3 and combat skills and totally ignoring all the cool cyborg parts you can nab which... sucks?
Like it sucks that cyberlimbs, titanium bones, crazy body armor, ect don't... make any sense to take. Its bad design when the fantasy of playing a metahuman Terminator is something that sold SR for 5 editions but 6th comes along and basically... removes it?
EDIT: Funny thing about these numbers. I accidently made the face have 3 less defense dice, rather than 1 like I said, on this samurai, as well as 4 less soak. That means the actual outcomes are much closer than what I wrote. For example, vs the Wildcat, it is 56 vs 55% chance of being hit, and their average damage per attack is 3.09. Still pretty much the same TTK, but the variance is pretty much identical meaning the outcome is essentially identical: Only 1 in 100 attacks will meaningly be different between these two PCs. Is 2 attribute points and 1 essence to get a 1% chance of not going down to an attack that would down you if you didn't take those worth it? I dunno. It is a less than 1% chance, its more like 1 in 200 attacks a freakin wildcat makes against you will care about those differences. You gunna even be attacked by a Wildcat 200 times? You gunna be attacked by a Wildcat more than like... 4 times in a campaign? Is that really going to help you more than taking tailored 3 and an extra 3 charisma going to help you? Or more perception, or more stealth? You probably will positively affect your outcome hundreds of times in a campaign with those abilities you gave up that soak for, including by allowing you entirely new avenues to solve problems. None of this is 'cheese.' None of this is 'minmaxing.' 6e's philosophy of 'have the GM balance their table' doesn't work here because the Face isn't eve 'technically' playing within the rules, they are 100% within the spirit of the rules. They are acting totally in good faith here and there isn't a realistic option to fix this that isn't essentially 'be really mean to the face' or 'houserule to the point the system dramatically changes resembling a re-write of the core combat system. ALL the face did was invest in a few attributes and take 'wired 3. They didn't do any Pun-Pun weirdness or quickened buff spell edge-reagent combo exploitating that you can point to and say 'Ahah, that is the problem' because everything that allows this is working exactly the way it is meant to work in every context.
Opportunity cost is real, and opportunity cost says Samurai are a dead archetype. Long live wired 3.
Also, TTK means 'time to kill.' Basically how many attacks/actions it takes to ice ya.
This is all also assuming you didn't increase athletics ever, purely out of gen stuff. Once you start bumping your defense dice via bumping athletics the gap closes even more in favor of the non-samurai: Even if they don't invest as deeply their investments scale down slower than the samurai and thus the gap shrinks unless the samurai really goes ham and the other guy totally abandons defense, but even then we aren't talking any difference vs anything outside of Red-Sams and Wildcats.