I'll preface this by saying that I'm not fond of the Github monoculture, but something like Github discussions or a forum on Github would be better for most of these things.

> If someone combines discord + discourse (basically an app, that has all your forums on the side bar with just one login, and people can create a new forum for anything, similar to how you can create a discord server) then I think we might end up going back to forums with more meaningful discussions and all information related to some issue in one place.

That's interesting, you seem to favor a "per tool" usage (all forums on one tool), while I would favor a "per project" usage. I prefer the "per project" as I don't want to have my identity always connected between projects. On the other hand, Github is almost forcing everyone to have a "per tool" usage. Since everything is already on Github, your only way to escape them is to enforce a "per tool" separation.