I know how it works. Yet to see how you system will perform at 4K native, use 150% render scale at 1440p or 200% render scale at 1080p.
Btw supersampling does look better. I have a 1080p display, but take screenshots at 200% renderscale since it looks much better with the way TAA works in FS2020.
I can’t see all the pixels at 4K, but the effect is the same. Downsampled either by tech or your eyes, same end result. The difference in image quality between 100% 1080p and 200% 1080p is very noticeable to me. Much cleaner, more stable, sharper.