I am also running everything at 100% with my 3080 and it’s already smooth and clear for me so no big improvement visually with this tool but I love the Worldscale setting. I’ve settled with 85% and it seems better for me.
I’ll also try to disable the sharpen process from MSFS and use this one (with FSR) to see if it gives me a better image quality
All in all, I think this tool is mostly for people struggling with their performance and using sub 100% resolution seeking better image quality.