User blog comment:HeresyHorus/Critical Strike Chance/@comment-1330314-20140415041810/@comment-24823162-20140416064150

Ok, so while the idea is interesting, and it could be done, I think that changing crit->AA amp would absolutely destroy the current game balance.

First, I'd like to make a special mention as to how weak crit is right now. Marskmen, in competetive play, are currently sub-par ranged casters, with a higher potential in the super late game, thanks to their high returns on stacked crit.

Second, the game is balanced around the stacking case. While you complain about crit being overpowered and balanced on unreliability, part of the balancing of crit is based on how your DPS becomes reliable much quicker at higher attack speeds and crit chances. Caitlyn's dps isn't bad with just an infinity edge, but it can be unreliable for 5+ seconds, while she gets enough AAs to get her 1 crit. However, if she also picks up a phantom dancer, it'll almost always take <2 second to reach reliable dps.

Finally, there's an entire archtype of character that would buy this new IE, and be impossible to balance due to the disjoint of crit dps from attack speed. Rengar, Talon, Zed, Garen, and to some extents Shaco and Xin Zhao are non-attackspeed reliant autoattacking assassins(in Garen's case, it's spin.) Their burst doesn't leave much time for additional auto-attacks, so attackspeed is rarely a good choice, but their autoattack damage is still an extremely large portion of their burst. Having one of these champions buy an IE and jump on you, killing you 1/4 times is annoying. Having them kill you 4/4 times is imbalanced. Simply nerfing these champions creates a complete reliance on the proposed AA amp, and nerfing crit in the change to damage amp will essentially remove marskmen from the game.