A little late guys….. already bought the game on the blizzard launcher and installed it on the deck that way. Then I played through the campaign, that was fun. Then I got to the seasonal content (that I was looking forward to as someone with hundreds of hours in Diablo 3) and I uninstalled it
Exact same experience on PS5, here. Aside from the campaign making my character an idiot in order to justify an ending that I would not have let happen, I very much enjoyed the story.
I got through an hour or two of season 1 and haven't touched it since.
No, it just means that it'll run through proton without tweaks, show proper controller glyphs and default to graphic settings, that lead to playable frame rates.
My mistake, I may have seen a post previously that suggested something more like “Diablo 4 is now compatible with Steam Deck”, and my brain immediately saw the title of a rather controversial game and mentally blocked out the post.