I've had playstations for multiple console generations, but I just ordered an OLED Deck as my first ever "gaming PC". Forgive the naivety, but could non-supported titles potentially get Dualsense features modded in?
Touchpad always works, but the haptic triggers and rumble need you to be wired. They also only work in supported games like Spiderman. I remember needing to go into desktop mode to enable the controller's "speaker" for the rumble.