As discussed in my qpost, I just got to "try out" a PS5 controller on my PC.
It's definitely not yet supported. Steam doesn't really understand it, games with thorough remapping tools like Final Fantasy XIV get buttons mixed up, but when trying a game with lots of vibration, Doom Eternal in my case, the buttons didn't work, however the rumble did.
It felt great. I could feel a battle in the distance, projectiles whizzing past my head, the recoil of my guns, and man did those launch pads feel neat. It's the best feeling controller I've ever held, and I have an Elite Series 2.