I don't see how anything can be coordinated when so many options are presented in a confusing way.
Of course, they don't have to choose Lemmy / kbin instances, but I'm worried that a lot of people will stay on Reddit given the inability to properly communicate alternatives.
Perhaps, experienced users of the suggested website could create posts that recommend it or its alternatives and provide explanations on how they function. This would help people better understand and determine if they find it appealing. Like you said, a list doesn’t help that much.
You can make posts and create threads inside threads now. The tags and roles are pretty useful for a community too. Still, doesn't compare to an actual forum, especially since you can't vote or sort the comments.
I came to Lemmy because I was reading so much about it, but to be honest I don't understand the federation concept well yet or how it impacts usage. The UI and basic concept seems intuitive enough from registering a few minutes ago and joining a few communities and replying to messages, but I still need to learn more about how it works and hopefully someone (Christian maybe?) releases an app that does for Lemmy what Apollo did for Reddit.