I cannot confirm this.
My results look good during upscaling AND when i watch them on my pc with kodi on a 82" QLED TV.
Remember the upscaling control screen on the right is much smaller than the final viewing in fullscreen. On smaller screens many videos look better that on on biscreen/fullscreen.
Now the question is HOW do you watch your results/videos?
Are the player settings correct? ALL Color settings, not just saturation.
Some users recommended disableing any digital enhancements on TV’s.
And yes it makes a difference when i watch my videos direct from pc/kodi with hdmi to the TV/Screen OR from USB stick in the TV OR as a stream from kodi on the same pc (network(not hdmi)
I must confess when i zap through my collections, i often have to change my TV/player settings for each video individual. Too bright, too dark, to sharp, not sharp enough, too much color, not enough color… almost every video is different. And then comes your personal taste in …
My mother likes the same movie with color boost settings at 100%
I get a headache from that colorbomb …
IN some videos i like to have that extreme soft wax skin look, on others i like it ultra sharp and real.
There is NO “1 for all” setting.