That's got nothing to do with VRR degrading the image quality, John prefers to use BFI which cannot be used at the same time as VRR. He is apparently super sensitive to motion clarity.
Personally, BFI is not worth the brightness hit for me, especially on a OLED.
My overall point is that there isn't a single TV out there that doesn't have compromises when running VRR content (at least not that I know of). Everything from gamma shift, raised black levels, flickering to options being disabled.