Basing a houserule on a munchkin build is a bad idea when it also punishes more-balanced characters. The Agi 1 character only has a running rate of 4 meters per combat turn, he's an utter slug that will die fast due to not being able to dive into cover and not be able to get away from grenades and such. On top of that, I'd simply not allow such an exploitive character.
This houserule, as you originally wrote it, means you can't have 4 Agility with two arms of 9, which is actually a character that pays a decent price for the +5 Agi on his firing. If he doesn't boost his Strength of 4 above this number, he's paying 109k and 2 essence for the 9/4 limbs and an average Agility of 6. Instead, he could have gotten an overall 7 Agility with 69.75k and 0.75 essence. So he pays a significant price in nuyen and essence for those extra 2 dice and extra capacity, loses 1 dice on Sneaking and Palming and loses 3 effective Agility for calculating movement rates.
Instead, such a character would have 2 7/4 arms, which cost him 89k and 2 essence for 7 Agility on weapon checks, 6 Agility on Sneaking+Palming and 4 Agility for movement rate. For 69.75k and 0.75 essence he'd have the same 7 Agility on weapon checks, 7 Agility on Sneak+Palming and 7 Agility for movement rate. This means he's paying 20k and 1.25 essence, as well as 1 die lost on average-agility checks and 3 agility lost on weakest-limb-or-natural-attribute aspects.
His benefits in return are having spare Capacity which also costs nuyen to use, the option to spend 18k on after chargen to be able to get +2 Armor total from Cyberarmor, and +2 physical condition monitor boxes which are only worth it when an enemy does Physical Damage rather than Stun Damage. Meanwhile, chances are he gets targetted by Stun Attacks because he's an obvious Street Samurai, what with the cyberlimbs. And if he ever decides to spend karma to raise his Agility to 5, he ends up making his limbs a waste of investment since now they only have +2, whereas the Used Muscle Toner 3 would still give him +3 at that point.
Perhaps you took all that into account already, and still consider cyberlimbs viable options when it comes to raising attributes. I, however, think this is already a rather painful choice in the short term, given the alternative which is cheaper and better in many ways, including cost and essence, and as such very likely outweighs the few benefits the Cyberlimb gives instead. In the long term, the character is only destroying itself because now if it gets any general augmentations or raises its Agility or Strength, it's devaluating the use of its Cyberlimbs and making the decision to get them even more an utter waste. You don't replace Muscle Replacement/Augmentation/Toner when you raise your natural attributes since they keep adding the bonus, however these cyberlimbs would have to be replaced.
And again Agility DOES NOT EFFECT THE PHYSICAL LIMIT IN ANY WAY, so can you stop bringing it up in discussions about a system most easily abused in terms of agility.
I am fully aware Agility does not calculate into the Physical Limit. However, Strength does. I also mentioned the phsyical limit as only one of multiple downsides. Not to mention you brought up both Muscle Augmentation and Muscle Toner to begin with when comparing price. As such, there was no reason whatsoever to shout.
Leaving the shouting aside, since you want to focus on the agility-abuse I left out melee in the first part of my post, since that'd involve Strength and thus the Phsyical Limit.
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I decided to try debating with you again, which I stopped doing after you claimed you couldn't see how it was insulting to suggest I'd throw a hissfit over not getting what I want from a GM. I wanted to see whether you were actually telling the truth about not having intended to insult me. In your post, you have treated me with contempt by telling me to look at a rule again, suggesting I haven't paid attention to the rules and don't know what I'm talking about. You could have simply gone "my problem is that with the averaging rule, the Agi 1(9) guy has 3 Agility for most tests". Instead, you chose to be confrontational by suggesting I don't know the rules well enough to provide meaningful input into the debate.
On top of that, you began to shout while you were the one who talked about both Muscle Toner and Muscle Augmentation. It's rather unfair to bring Strength into the equation and then complain I shouldn't bring up the Physical Limit. Now I consider you a person of decent common sense. So since you brought up Strength to begin with, I assume you knew fully well you had no right to criticize me for mentioning the Physical Limit. Which means you used it as a mere excuse to shout at me, rather than sincerely venting frustration. This is supported by you assuming I don't know what I'm talking about, rather than asking for clarification in a way as I have done above.
Given the extreme way you are treating me and expressing a condescending view, which is highly insulting and is not justified by my post in any way, I cannot help but assume you were lying when you said you weren't trying to insult me before. You appear to have a personal axe to grind with me and are using excuses to target me. As such, I will bow out again, and once more request you do not contact me, nor here nor on SRU. At SRU there are other volunteers you can contact if ever you need one. I do not trust my temper when it comes to dealing with someone who deliberately insults me and then lies about it, lacking even the guts to acknowledge their own deeds. As such, I do not have any desire to communicate with you regarding any matter, even official ones.
