It takes more MP to use Raise then Clemency by just over 500 MP, can't effectively be used by a MT and if the OT is having to rez in the first place, probably bigger problems for content where it also might matter. I'm all for Pld battle rez but in the grand scheme of things thing where it would "kill" balance said balance probably doesn't care about it much and places where it could be more needed you'll probably wipe anyways.

MAYBE if Pld got Swiftcast Rez it could break balance. But they ain't gettin that anyways.