The tag ux-design doesn't sound like one we need, because this site is all about UX itself. Should it be removed?
Yes, it should be removed because it doesn't add anything. On-topic questions here are about UX anyway, so ux-design is unneeded.
The only reason to keep it that I can see is to differentiate these questions from ones dealing with ux research... But we don't really get a whole lot of those. I say nuke it.