I noticed that 9/10 times the colors suggested by One UI's often don't match the colors found in wallpapers. I would purposely pick a vibrant wallpaper with vivid reds and greens and the system will suggest a color scheme that is not representative of the actual colors in the wallpaper.
To be clear, I'm not saying all colors should always be vivid colors, we all have different tastes after all, but I'd suggest a much accurate color extraction to match the colors in the wallpaper you selected.
Also, it'd be nice to be given an option to tweak the color scheme suggested so that we can fine-tune to our liking.
Agree that the color extraction needs to be better. I always feel like there could be more color variants and that what is given doesn't always match with the wallpaper.