Thank you for your responses. It appears that ease of adjustment is the biggie. The English lesson wasn't needed since taboo can be a noun, verb or adjective and sometimes words are used to get a point across whether accurate or not.
It wasn't an English lesson, but I was trying to draw a distinction in a short post.
For comparison, there is a group of people who seem to treat having brakes on a fixie as taboo: a breach of some sort of code, or ethos, or whatever they might choose to call it.
I don't think anyone is "against" vertical dropouts for
that type of reason, but rather for sound practical reasons.