I'am tried to search about it and nothing found. Can't get it why you can't use that tag. On e621 it's allowed. What I missed?

I assumed it's because it's unnecessary since basically every pic has a tail? what there should be is a tailless tag for the rare pics that don't have tails

Can verify firsthand that the tail tag is super useful for image prompt wrangling in gens

that should count for something..right?

especially because the more specific tags like *_tail are much less populated than they could be for the above purposes