User blog comment:Astanas7/Is there literally any way to counter Yasuo in Dominion/@comment-4652200-20140201170433/@comment-6301771-20140202020110

Lifesteal calculates based off of the damage dealt to a champion AFTER resistances, which is what he's getting at: Building straight Health may keep you alive just as well as building Armor, but you're also going to be easy to vamp off of, as LOTS of damage is going to be dealt to you: You can just take more.