Apple said they will keep Rosetta 2 for select usecases, such as gaming. They do have a user base that uses Steam and bought mac games - without rosetta that would mean the users could no longer play their game. And no one ports 5-10year old games.

Can one run a windows version of a game well over on say, a MBP?

I ask because my current laptop is getting long in the tooth, and if I were just buying it for productivity stuff, the current MBPs are beasts, but last time I checked years ago, gaming on os x was in a sad state, even compared to linux.