I have been running Linux full time on my gaming PC for a number of months now. I have found only a few instances where a game hasn’t worked. I know that certain games won’t work because of their invasive or Windows specific DRM, but for me personally I don’t want to play those games anyway. Some examples of games I can play without issue: Horizon: Forbidden West, Brotato, Plate Up, GTFO, Dome Keeper, Noita, Enlisted, Power Wash Simulator, Risk of Rain 2 …
We have both MySQL and PostgreSQL in our production environment. Postgres is way nicer as a user of the DB. I created a document months ago outlining a dozen different things that Postgres does that MySQL either doesn’t do or does worse. I can’t speak to managing the DB as I don’t have experience with that.