Lol, lots of people complaining or saying no difference in image quality. Main benefit is in performance, very few people have a rtx 3080 or 3080 ti, so it really helps, fps was locked at 60 on 4k performance mode (top preset), only slightly lower on DLSS Quality.
You are lowering the load on your GPU, due to lower internal game resolution, it's never gonna look drastically better than native.
Previously, I had to run the medium preset (and lower other settings) to get a steady 60 fps, as the performance can really dip, even in early prologue / wintery weather scenes.
My brother bought me RDR2 on the xbox one on release and it was almost unplayable, around 20-30 fps, even at 720p.