I am not expecting "fit" to be an issue, unless they aren't winning. And then it is a chicken or egg thing. If they are loosing, everyone will be saying "bad fit". It they are winning, you won't hear anything about fit.
I think part of the reason he picked PHI is that they don't need to do any other trades. They don't need to bring in Anthony Davis or Kyrie Irving which would be the case for CLE for example. This is a good team just as they are. Injuries or durability is an issue. But even without Embiid, this is now a playoff team.
I don't know how they can Nurse Embiid along to get him through a playoff run without wearing down (yes, pun intended). My guess is he hardly plays in the regular season. No 65 games for him, that is for sure.