Steam's been fantastic! Problem for me is that some of the battle.net games aren't on there. If there's a way to download those somewhere and run them through Steam that'd be incredible. I didn't even think to consider searching around for that possibility.
I've seen people run Diablo 4 on their Decks so it's clearly possible, I'm just still learning how to troubleshoot Linux and I'm trying to be extra careful since their OS doesn't have much in the way of guardrails to prevent dummies from nuking themselves