The ign preview suggests otherwise: https://www.ign.com/articles/steam-deck-hands-on-impressions-details-valve-handheld-gaming-pc https://www.ign.com/articles/

The ign preview suggests otherwise: https://www.ign.com/articles/steam-deck-hands-on-impressions-details-valve-handheld-gaming-pc https://www.ign.com/articles/steam-deck-hands-on-impressions... > This flexibility means you can do pretty much anything on the Steam Deck that you can do with a regular PC. Connect a mouse and keyboard? Yep. Alt-Tab out of your games to a browser or video? Sure. Load third-party programs or even other game stores like Origin, uPlay, or Epic Games Store? No problem. You could even wipe Steam OS entirely and install a fresh version of Windows if you want – but the default Steam OS is smooth and efficient at getting you into your games, so I imagine most people won’t want or need to go that far. The point is, you can if you’d like to.