The current board uses 'boards' It has a number of boards mostly with nothing in them, certainly with little changing. They take up space at the index page, and look shit.
You assign a category....if it's not a category much used, who cares. There will be a default category, you don't have to do much. If you choose to make a category attribution is becomes meaningful.
Apart from some people not liking the visible tags, I can't imagine what possible problem there is.