I’m not a big fan of hiding or moving posts until they are fixed. As long as it’s done fairly promptly I think it’s better to leave it alone. People get very touchy about their posts being arbitrarily (as it might seem) moved around.
I like the idea of people not being able to post without selecting a category for ALL posts. I’ve been lax about checking people have properly categorised their posts and wil do better, boss! Also ‘uncategorised’ should be a last resort so definitely move it to the end of the list.
I’m hogging the debate now so will step out and see what y’all come up with.