I really do like the haptic feedback of the PS5 controller. I didn't anticipate what a cool feature it'd be and how much games can actually do with it.
Random idea, but it'd be fun with a heart rate monitor next, so that someone can make an online horror game where the goal isn't to defeat the other players, but scare them as much as possible (detected by heart rate).
Okay, it's mostly a joke, maybe don't build in a heart rate monitor, but that'd be such a cool game tho!