If they do that, they'd need to set the map in the background first, then fill the lobby with players. You're gonna end up increasing your wait times the more maps you exclude.
It wouldn't work the other way around. You'd eventually end up with a group of 12 that between them none of the maps could be played.
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Or just have a voting system. And remove maps people don't like and rework them
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I'd be down with them adding a choice of 2 maps when loading.