It worries me that all those communities moving to Discord will one day suffer though all this all over again, once Discord enshittifies and drives them out. Relying on a closed, proprietary and centralized service for user-generated content is a bad idea, as we all learned already.

Also -- unless I am missing something here, with Discord you are seeing posts in a strictly chronological order. Yes, you can like and react to posts, but that won't bubble and auto-curate great content to the top. I was once in a very popular Discord and the amount of random posts filling up the feed made me leave it after some time.

Discord has a built in forum like interface, it's quite decent - but as others have said, it's not indexed by google and thus pretty useless for newcomers.