Currently VRChat mirrors can be set to scale based on your headsets resolution
BUT are hard limited to a max resolution of 2048x2048
Problem with this is on high res VR headsets, mirrors look pixelated and bad. Considering that most people see half of this game through mirrors, this is a big problem.
As more high res headsets get released, this will inevitably become a larger problem, as it already is for anyone with a high res headset like a Pimax or a G2.
So please, increase the limit.