Looks fine. There's an existing flapping tag, though.
Well the one you're pointing to doesn't seem to be in uses at the moment. We can either combine them or replace the one not in use with the one in use.
I like it, but what are we going to do about the braids Wiki entry now that there are other tags with overlapping definitions?
I keep thinking of braids to be used in some different fashion every time it's brought up. I had a feeling my wiki definition may be in conflict with that specific entry, but at the time I couldn't find a solution towards making braids different from the others.
Tell people to keep using braids for everything (in addition to using hair_use, flapping, or braid_loss when applicable)?
From my experience being on Danbooru related site I find this to be the most reasonable thing to do. Danbooru generally does this towards similar situations so the same could be said for this one. All four aren't mutually exclusive from one other.
Or change it so we only use braids if the picture has braids of interest that are NOT flapping, hair use, or braid_loss?
Depends if post like these few cases count as cases where their braids are neither flapping, hair_use, or braid_loss are applicable and/or wouldn't describe them the best?