The Steam Deck is an extension of your Steam Account. Not a separate console. it’s another computer but in handheld console form. Consoles have ruined that aspect imo and is primarily why I went to PC gaming in 2013. I was tired of having a Xbox 360, Xbox One, Xbox One S and not having any backwards compatibility for the games I wanted to play. Any games you purchase inside Steam will work (for free - no repurchase needed) on any device you log into provided the specs of that device meet the requirements for the game you want to play.
not for the games i played. Eternal Sonata being number 1 on my list