The Steam Deck doesn’t have the split screen co-op that Microsoft is insisting the series S have with the game.

In fairness to both Larian and Microsoft, the very feature that seems to be keeping Baldur’s Gate 3 off the Xbox Series X|S is also a problem for Steam Deck. The developers have disabled split-screen co-op on the handheld, and while gamers have found a workaround, it does seem to negatively impact game performance.