Discord etc. also requires a lot more regular attention to keep up with I find. The threaded nature of forums makes it easy to come back once a day or once a week or whatever and catch up with it, whereas in a Discord most of the valuable content will be lost in noise.

I do like that these chat groups are popping up for communities though, would just be nice to have the forum option too.... but I guess you have to go with what the majority actually use! And I'd much rather Discord than Facebook.