I agree that broad categories (
kicking or even
striking) should be in place.
The problem with technique specific tags becomes one of sorting: both Judo and the Bujinkan have techniques that share names, but with completely different methods. So if one
A proposes a tag for
osoto-gari (for example... I believe this is one of the ones that differs, but can't recall off the top of my head), intending it to be for Judo, and I assume it's the technique for the Bujinkan, then we're using the same tag for different meanings... Then there becomes the added further problem of various arts having different names for the same technique, which become tag synonyms, further confusing the issue...
Broad categories seem to be the better argument in this case...