Why can't I import a community?
Because the owner/moderator of a community owns the community itself, but doesn't (usually) own the community's content (which is created by others and so is owned by the people who post it), Dreamwidth won't allow the import of communities from other services at this time.

We aren't against community importing "forever and ever", but it's not going to happen soon, and there's no timetable for when it will happen. There are a lot of copyright and ownership issues to be resolved in a non-evil way before community importing can happen.