We currently have a hardcoded set of tags that automatically get put into a 'Genre' category. I think further categories would be useful, to begin with one called 'classifier' or 'type' or 'descriptor'*.

This would contain tags such as:
"soundtrack"
"video game music"
All behaviour would be the same as the current Genre grouping re. display etc.

See the discussion related to these types of tags (whether they are a 'genre' or not) here: https://tickets.metabrainz.org/browse/MBS-11545?jql=text%20~%20%22genre%20rym%22
This would eliminate any disagreement, allowing people to include them in the genre field if they wish, in their own field, or ignore them completely.

Other useful groupings may come up in future as well.

*as I write this I see that RYM already has similar plans, they are calling/will call this grouping 'descriptor': https://rateyourmusic.com/genre/Descriptor/