User blog comment:Emptylord/Sandbox/Custom Patch Notes/@comment-4068613-20140214033305/@comment-4068613-20140306040404

The new IE proposal is different from rabadon's in that Rabadon's simply takes a proportion of your ability power and adds it to your final total. The new IE takes a proportion of your crit damage, which is a proportion of your attack damage. So you have to multiply twice instead of once, and one of the values isn't immediately visible on your stat HUD.

I won't claim that the math is strictly less rigorous for Rabadon's, but it certainly feels less intuitive.

I understand what you're saying about "pure skill", which is essential in the uppermost echelons of the game, but for lower-level players, I think the added burden of knowledge as to what "crit" means raises knowledge that needs to be learned by a beginning player. I'm not sure increasing the knowledge gap is healthy for the game.