This repo is currently also the only place where we can have discussions about the WinRT API surface/UWP app model in an acceptable fashion. As a result, we've seen multiple proposals/discussions being opened over the past weeks and months which do not belong to WinUI at all. In that sense, having those threads grouped outside of the WinUI Issues space seems like a good call to me and the new Discussions feature would allow that.
PS: We need to hammer this away again and again: We need an own place where we can discuss WinRT/UWP app model related issues/proposals with other users/developers and Microsoft engineers. It is badly needed! (The fact that I have to write this here in an unrelated repo just shows how bad the current situation is.)