I was looking through the different tags and noticed that although the old haiku tag had been made a synonym of poetry, limerick is still its own tag. I wanted to ask if there is a reason for this distinction in the first place, and if not should limerick questions be merged to poetry as well?
Tags are allowed to have subtags.
Just like we're allowed to have both the general mathematics tag and specific tags like geometry, number-theory, combinatorics, and so on, it's also fine to have both the general poetry tag and specific tags like limerick, haiku, and so on. Is the limerick subtag causing any trouble for the site? Being misused on questions, acting as a meta tag, anything like that?
I wouldn't especially miss it if it was gone - it seems unusually specific for a tag, and not really describing a type of puzzle so much as a type of presentation - but it's been used on 30+ questions so evidently some people like it and find it useful.