Difficulty is one of the best post-game topics because it encourages honest opinion instead of just praise or criticism. A good thread here can dig into whether a game felt fair, forgiving, grindy, or genuinely rewarding
That gives people a reason to compare their own experiences rather than arguing in abstractions. It also works for many genres because balance questions come up in almost every game
The interesting part is whether players want challenge, flow, or just enough friction to make progress feel earned