I think that's a reasonable thing to ponder, but I also think this concept can be used as a convenient rationalization, especially if it's a T saying it (in which case it might also be condescending and moralizing). I learned a lot from my therapy nightmare but I also got traumatized in the process. People also like to say "everything happens for a reason" which I think is even more dangerous, and can be used almost like a weapon. Next person who says it, I am running them over with my car.