It's nice and easy on the eyes. I conjecture that glossy and matte (as seen here) styles of skeuomorphism gave way to more abstract design since:
- Skeuomorphism is hard to get just right without being excessive and tacky
- Saturated, simple blocks of color pop out more, particularly on the increasingly prevalent mobile UI
- And thus also have better shelf appeal
If it were up to me, the red line would be when buttons and interactive elements are indistinguishable from text. The stock Android settings is probably among the worst offenders in this regard.
What I really miss is light mode that isn't hated for blinding users and dark mode that doesn't plunge the user into the void. Those "toolbars" look lovely, perfect for any lighting condition or time of day. I've yet to understand why, at present, designers insist on pure white everywhere when it comes to light mode. Maybe everyone is using the night light filter so it doesn't matter? At least pure black dark mode makes sense for power efficiency on OLEDs.