The game has settings for tweaking aim assist and such. It is exceptionally well done. As OP said they ask you if you’re playing on a Deck when you boot up, and it even has a Deck specific options menu for tweaking aim assist and what not. I played the first level on my Deck last night on regular difficulty and had a blast. Then I switched over to my PC and upped the difficulty and also had a helluva time there. It’s a phenomenal shooter.
GTA 6 is looking to be the first title that will need the newer hardware. That’s all I can think of off top.