Requested feature overview description.
Automatically remove the tagme tag if a post has more than 5 tags.

Why would it be useful?
This would cut down on the amount of posts that we have under the tagme tag, and make it easier for people who want to go above and beyond to just search for posts that have 5 tags.

What part(s) of the site page(s) are affected?
https://e621.net/post/show/*
Any page that references how many tags a post has

-1

Uploaders sometimes add tagme because they can't remember the name of an important tag. In this example the uploader was probably looking for triple_penetration and chastity_cage.

-1, I use it when I do not know X, or when I've simply removed invalid tags (and invalid_tag) and sourced the artist & source page.

Tagme shouldn't be removed automatically: it has to either be added intentionally, which your system could defeat; or is added automatically when someone leaves no tags, which only then your system would aid once someone tags. It's not that hard to manually remove if you do not suspect that it'd be useful, or to check tag histories to pick up context as to why it is there.

-1

No, tagme is there for a reason. It is useful because it allows people to double check piss poor tagging.