[Whoops, I read you as saying there was no reason we shouldn't use FamilySearch profiles. Guess I'm in violent agreement.] No, [that is, YES] we should not be using FamilySearch profiles as PGM sources. We specify that we use high-quality sources, or the best available *contemporary* sources -- that is, sources created when the person was alive -- and FamilySearch profiles are neither contemporary sources nor high-quality sources by any definition of the term.
Many are every bit as bad as Ancestry trees can be. Absolutely anyone can create one, without any kind of source or evidence.
Now many of the *sources* available on FamilySearch are top-notch, and there are a lot of digitizations of contemporary sources to be found there, but that's another matter entirely.