I think, in the end, we actually agree. You are saying that the titles do not always make sense on their own. I am saying that whatever sense they make, the additional meanings brought by the prefix are not worth fighting for.
So, yes, I agree that all UNIT stories and boxsets (old and new) should be named without the prefix "UNIT". Then the rules described in that old thread would finally explain the names of all Big Finish audio stories on this wiki.