I think based on timing your objection is with Material You / Material Design 3 specifically, which replaced Material Design 2 starting in Android 12. Android 1

I think based on timing your objection is with Material You / Material Design 3 specifically, which replaced Material Design 2 starting in Android 12. Android 11 was already using Material Design (2) (the card theme) which replaced the previous theme, Holo in Android 5. Holo was the cyberpunk-y black with blue highlights interface, though honestly Kitkat (4.4) had already started that trend that led to Material, removing colors from Holo. I'm also not a fan of Material You to be honest, the "colors from your background" gimmick just results in all the colours being muddy boring desaturated ones, and the general low contrast + rounded look just doesn't work for me.