My question is (hope I can post a question as an answer on meta, I mean, we're between ourselves, right?:) : what is the user benefit of removing it?
Perhaps I'm just too new and the answer is logical to everyone else, sorry for that...
I don't think we'd have a question wether we want to remove a certain badge, esp. a bronze one: badges are infinite resources (you could have more than 1 billion of them and the system wouldn't really notice), it doesn't really hurt the interface, so, why bother?
Tags don't hurt the interface, so physical / visual UX is not appropriate here.
Tags don't eat up resources, there's no upper limit on how many tags an SE site could have.
The only think I could think of is not to allow new posters to "avoid" meaningful tagging, and make them really think of a meaningful tag. This goes hard if they're newbies who don't know the taxonomy/vocabulary (to the perfectionists: ontology/language) of UX.
Next question: ok, we know why does it hurt to have it for new questions, but why does it hurt to have it for the existing questions?
Does it mess up the tag browsing interface? I hardly think so. Of course, most questions on ux is about user-interface. Hardly a surprise, I mean, in order to have an experience, the user has to use an interface, right? Again, that page is mostly a limitless resource.
The only part I could think of that it messes up our sitewide user statistics, I mean, according to statistics, one of my top-3 tags is the user-interface, hardly a surprise again (I'd love to have design-process, or guidelines, but that's life). So that is a limited resource, you only have 3 spots.
On one hand, it's perfectly sensible to remove it, as it's meaningless.
On the other hand, we build serious barriers to our novice users: if you don't know the UX vocabulary well enough to know how to tag your question, don't ask. Wouldn't it be a better approach to allow this escape hatch for tagging and people with actual experience in UX would re-tag the question?
Let's face it: the more experience you have with UX the less questions you're likely to have. The more experienced questions we allow, the less people with more mundane problems will come here, as instead of giving them a site where they could learn what they need of this profession gradually, we provide a staircase with a really high first step to take.
I'm not saying we should allow stupid questions here, but perhaps give a chance to newcomers. An escape hatch does just that.