Do you refer to lower quality of Oculus Quest vs. desktop VR headsets (eg. Oculus Rift) in general, or to some particular quality issue mentioned on the forum?
The most recent opinion about general quality I can find is: VR Headset ( For Phone and PC ) - #8 by njay
The major issue with VR experiences we had is VR Perspective seems strange, but it applied to all the devices, and it was fixed a few months ago.
Some time ago, @Random reported significant performance drop in Oculus Quest : Drop in Oculus Quest - ShapeSpark VR Quality but I cannot find a follow-up. @Random, has this issue been resolved eventually?