This is because only native resolutions give you best sharpness.To be honest I tried reversenx and even at 720p handheld it does look a bit washed out... It would be interesting to see if some Mod can apply antialising
HOS only outputs 60Hz meaning that only 30FPS and 60FPS have proper frame pacing making other framerates look bad unless you want to go below 30FPS.Could they've made like 50fps but with proper native resolutions?