Dumb questions maybe. But I mostly keep Windows for like Battle.net games. Is there any way to play Overwatch II or Diablo IV in Linux? With proton or any other way? Legit would tip me into that realm. I’m a Debian fan if that matters. But I’m comfortable in other distros. Except Arch 😆
Battle.net games have been some of the most reliable non-steam games you'll find. You'll have trouble in the Riot Games space (League on Linux, Windows 7, and 8 are all dead in the next month due to Vanguard), and some Epic Games (Fortnite), but if you're a Battle.net/Steam gamer Linux is ready for you.
Diablo IV steam version has officiall support for Linux as far as I know. Or rather, support for Steam Deck via Proton, which is practically the same thing.
That would be the easiest path, but would cost you!
You can try to install the battle.net version via Lutris: https://lutris.net/games/diablo-iv/ and it should work. I haven't tried this game in particular, but had a great experience with Lutris in the past.
It is a great front end for Wine/proton and a database of install scripts and configurations for many games.
Bit off-topic, but if you would want to also play games from the Epic store or GOG, be sure to try Heroic Launcher.
I play StarCraft II regularly, have played Diablo IV and just started WarCraft 3 recently, all without any issues. All you need is proton or install steam and add a non-steam game.