Before I go about suggesting synonyms or whatever (on Meta, since I cannot do so myself), I wanted to clarify what the naming convention was.
Most plugins I see use the plugin-name convention. The only reason I could see airline being different is that its GitHub name is officially vim-airline/vim-airline. And yet, many plugins do strange things with their names (I've seen
name-nvim, etc.) that I don’t see represented this way.
Personally, I’d like to unify the tags, I’m just not sure which one is the best “canonical” tag.
In light of Martin's resignation, I'll attempt to address his usual counter-argument: cleaning up tags is like bailing water out of a boat with a hole in the bottom.
While I agree that it's impossible to ever keep up completely, I would rather see us keep the tag system well-oiled every now and then than ignore its slow death—I don't use the tags to find things often (on this site—on others, that's not as true). But someone may.
(Apologies to Martin if I've mis-represented his stance.)