User blog comment:Willbachbakal/(Item Concept) Revamping Life Steal/@comment-5588011-20150826183220/@comment-5588011-20150829180509

It isn't really a buff to Rammus, it's a nerf to all DPS champions/champions who can't burst ADCs. If this change went through the meta for tanks would be those who either burst ADCs really well even with burst/tanks who can shut down an ADCs sustain. By this change going through you limit the variety of tanks that are available and prevent tanks that do DPS damage which should always be an option.

It isn't really a matter of lifesteal being too strong or weak, but more the fact that it scales off AD and AS independently. If the lifesteal is too weak then it's useless to get over another damage item. If it's too strong it just slips into the field where you dominate all the lanes because of how much the sustain is invested in your own stats. This isn't the case of Will of the Ancients because the sustain is limited by the ability as well as CDR which has a limit.