First of all, your test case is flawed.
Why not:
Hacker
Cyber Combat 6 (Personas), Logic 6, attack 6 (increased by 1 with Decryption) - which can be done with a starting character. Total dice 14, limit 7
Rigger
Firewall 5, Intuition 6, Willpower 5 - total 16 dice.
Big difference when it is 14 for the hacker and 16 for the rigger.
And again, if you roll 1 more hit than the hacker, then he takes 1 hit. If he rolls 1 more hit than you, you have to soak at minimum 8 boxes of damage.
You cannot take Sleaze out of the equation, because it is PART OF CYBERCOMBAT. The act of using Hack on the Fly to increase the number of marks on your target to increase the amount of damage you do IN CYBERCOMBAT is a big part of CYBERCOMBAT. (caps since you are so insistent about making this about cybercombat.)
It is like saying, "Hey, if I just shoot at you while my eyes are closed, I can't hit you. Shooting is gimped in this game." and someone says, "Well, you can open your eyes." And your response is, "I'm ONLY talking about shooting with my eyes closed, so limit the discussion to that." It is a silly tiny little niche that doesn't actually happen.