VRR works really well already - some Nvidia users might lose extra functionality like Reflex Ultra that, when paired with VRR, can smartly adjust the frame rate cap. But VRR itself works.
HDR is a difficult beast though… It’s hard even on Windows, and very problematic on Linux (though with Gamescope, KDE Plasma and Wayland you can kinda use it already).
Bluetooth headphones work well with the Steam Deck, I specially like how you can pair your phone to the Deck and it will mix the phone’s audio with the game audio (so you can have music or a podcast playing, for instance)
For those asking how to do it, simply enable Bluetooth on the phone and then go to the Steam Deck’s Bluetooth page, find the phone and pair it from there.
To be fair, cheating on a MMO is very different from cheating on a precision FPS game.
If you do pixel perfect inputs on a MMO it barely matters. If you do pixel perfect inputs on a FPS you can win an international tournament.