Isn’t there a Retroarch core for Doliphin? And Retroarch is on Steam. Maybe the Dolphin core is not available on the Steam version though.

Anyway, thankfully if you are tech savvy enough to get Dolphin to work, you are more than likely also capable of side loading it on the Steamdeck.

The copyright term for works owned by a corporation should be cut wayyyy down. I’m fine with a long copyright if it’s owned by a person, but corporations shouldn’t be able to lock down things that are older than like 20 years old. People shouldn’t be forced to buy a long discontinued console in order to legally play a old game.