User blog comment:Willbachbakal/(Item Concept) Revamping Life Steal/@comment-24795478-20150825144017/@comment-1330314-20150826143854

Alone, yes, but the number I listed above is a constant heal, and not an amount based on damage dealt, which means that it also completely ignores all armor-based damage reductions. Because champions end up building enough armor to reduce physical damage (and therefore life steal) by around as much as crit amplifies it, marksmen would heal for about the same amount, and any class who doesn't build crit would also be at an advantage.