Have been in using greyscale on and off to reduce my screen time. Due the issues that the author reported I switched back and changed the icon colors to monocolor grey with black wallpaper to atleast keep the phone default UI color free.

The first behaviour it changed is making app logos of Instagram, YouTube, Reddit stand out. Some of these apps became a reflex click when I unlock my phone usually as a fidget. Greyscale takes away the lure of these app icons.

Love the shortcuts tip. Setting it up to see if I can sustain greyscale full time now.