It looks like many of the current platforms that support communities aren’t recognizing long-form post. Hopefully this is just because the spec is so new! In the current spec, I believe long-form posts will be the preferred medium used in communities since they can be replaced to change the community they belong to.

This is critical given that the spec will require moderator approval to post and creating alternate communities will be likely.

The alternative of making communities open and requiring post removal would be extremely vulnerable to removal.

Moderated communities optimized for replaceable events seem like a great solution.