Like benji said, the retroarch situation on steam is some sort of weird half assed beta? When I saw it initially I was like, "why the fuck would retroarch want to be on steam anyway?" but I immediately had a eureka moment when I learned the steam deck will be running steam OS out of the box. If they CAN get everything running nice through steam, great. If not, whatever, there will be a million and one ways to get emus running on this thing.