User blog comment:Willbachbakal/(Item Concept) Revamping Life Steal/@comment-5588011-20150826183220

I think the main problem with making lifesteal scale with AD is that instead of lifesteal being a defensive pick on someone, it actually becomes more useful to snowball ahead with the item. The changes would reduce the emphasis of defensive stats on ADCs e.g Graves and in the end bot-lane/AD assassins would be even more snowbally then they already are. Also there's the risk where ADCs/AD assassins reach the point where the defensive item due to the fact it bypasses defensive stats means that low damage dealers, e.g Tanks especially may not be able to do enough damage to overcome the lifesteal that the ADCs have on them, reducing the satisfaction they gain from tanking as ADCs would just heal off them. A large part of a tank's satisfaction is how little the enemy opposition gains from attacking you, if this change went through Rammus would be majorly nerfed as well as other low damage tanks. If the heal was nerfed then there'd be little point to having life steal, yet if it was buffed it would just be easier slip into the point where whoever gains a lifesteal item would dominate faster.