Had this idea recently as I've noticed that new players don't really understand what maps are typically played 8v8. It seems like there is a pretty consistent set of maps that could be tagged with 8v8 in addition to the "team" tag.
Since 8v8 seems is possibly the most popular mode, I think it is worth adding. It would also be cool if somehow the map sets could be filtered in a lobby, so that you can use commands like NextMap to pick a random map in that map set.
This seems like it could be a low effort way to simplify the lobby experience and make sure newer players know which maps are suitable for 8v8. I'd leave the map list open to the community first to determine which maps fit the 8v8 tag.

