I've always been surprised that most games still don't offer vibration intensity adjustments as an accessibility function, instead just having a toggle. It pops up now and again, but it's often not very fine-grained. Sony has a version of it built in at the system level, but it would be cool if end-users could further tweak the effect.

I think the classic Nintendo marbles demo that they ended up shipping inside 1-2-Switch is still one of the coolest rumble things ever done.