User blog comment:Dj0z/AP on supports - quick analysis/@comment-1618239-20120508163902/@comment-5045559-20120508164919

That is true to some extent. Lategame, fights involving at least 2 champions on one side (the carry being healed and the support) tend to quickly become teamfights, and you then need massive healing/shielding to protect someone who's being shielded. I think only soraka with her double (triple with summoner spell) heal, and the armor bonus from one of them, can achieve that. Or Shen. Also the efficiency is much better if it's someone with resistances that's focused, like an offtank, but carries don't usually have much resistances. Overall that point makes AP soraka even more useful than the other AP supports imo.