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I can’t speak for Epic Launcher games (I know that Heroic Games Launcher exists but I’ve not personally tried it with Epic games) however Blizzard games absolutely can be played in SteamOS - you can utilize something like Bottles or Lutris to install the Blizzard launcher, and then download the games from it as normal and run them. It is how I originally played Diablo 4 on my Deck before I picked it up again on Steam. I swear I remember both Bottles and Lutris even having an “Add to Steam” option to integrate shortcuts directly into Steam (and thus, coming up in the Gaming Mode UI) but don’t quote me on that one.
Blizzard games are actually some of the earliest non-Linux-native games that I remember running very well back in the days where we just had Wine (before Proton, DXVK, etc) which is something that always impressed me.
I dual boot on my primary/desktop PC, and only run Linux on my laptop and Steam Deck.
I find more often times than not, I feel like I’m either fighting with Windows or it does these small but annoying things that when added up tend to really get on my nerves. For example, one thing that I’ve been running into a lot (and happened earlier today) is if I put my computer to sleep while its booted into Windows, it’ll randomly decide to wake itself up for who knows what reason - flooding my room with light often times while I’m trying to sleep or relax. It does it enough where I should by now remember to just physically turn off my monitors when I put my computer to sleep, but why should I have to? The 95% of the time that I’m booted into Linux, if I put my computer to sleep it stays asleep until I explicitly wake it up, and thus I haven’t formed a habit to turn the displays off.
The only reason why I even keep Windows around on this PC is to occasionally play Destiny 2 and some VR stuff with friends every now and then.