Jim Sterling went into this a few times, likening TT to a magician with one really exquisite trick. The problem as you put it and he explained, is overexposure shatters the illusion. Instead of trying to invent new tricks, or at least new ways of presenting them, they just went mad exposing people to the same device ad nauseum. It didn’t help that many of their recent titles were very grimdark, which gets tiring, or that their engine was old.