I’ve seen Doom run on calculators, an Apple Watch, hell I think some guys at MIT got it running on an abacus.
There is an old meme about, “but will it run Crysis?” Turns out the Steam deck WILL run Crysis.
But not Doom (1993). Because that’s just too much to ask.
EDIT: Before you respond to this post, please read the part where I claimed Doom was run on an abacus.
This is OBVIOUSLY humor regarding the rating system Steam uses to decide if games work on the SteamDeck.
This is not a TECHNICAL indictment in any way. Stop explaining what supported and unsupported means.
Unsupported has a very specific meaning, and is not synonymous with incompatible. By default Steam only encourages the use of Proton with titles that have proven their compatibility with flying colors. This is because Steam's business model is predicated on the things people buy "just working". Most other titles work flawlessly, but require you to tell steam in the settings to force-allow the use of proton with all non-linux-native titles.
Supported generally means that they put in some kind of effort to make it compatible. It's up to the developer to update whether or not something gets marked as compatible.
Nothing was done to Doom to make it compatible with steamdeck it just runs fine on it by default