Since the "forums" came up several times: I'd agree. In this case you'd choose something like Discourse or Flarum. Those are non-federated forums. And they offer some nice features, Lemmy doesn't have. A lot of Free Software projects use Discourse. It's more lightweight, has proven to be robust, it offers moderation features that are tailored to the use case, better ways to organize posts, you can mark correct answers, integrate itinto other services and do 50 other things plus install plugins. It's just better and easier to do it that way. And that's why people do it.