There are limits as to what runs well on the Deck and what does not run well.

When I got my Steam Deck I was asking around to see what the “must have” game is with the caveat that I already have a Switch, Xbox Series X and PS5. So what’s a must have game on the Deck that I can’t already play?

. . .

The answer I got back was “Well, emulation, piracy, and streaming from the Xbox and PS5.”

There really isn’t a killer app on the Deck, and that’s fine. I bought mine to better explore the Steam ecosystem as I had no gaming PC at the time.