i disagree about that one.
im not a UX expert by any means but my first impression at WWDC seeing liquid glass was "holy shit, they pulled that off? i know apple would never compromise on legibility, so... how? there are so many situations where this won't work, and they can't exactly control the content that the buttons are overlaid on top of"
cue my confusion when it was exactly that: an obviously problematic idea implemented with all the obvious flaws showing up
they have largely fixed it now, half a year later, but the liquid glass isn't very liquid anymore. it's frosted. which is fine, but obviously not the original idea they were going for
contrasty backgrounds are fundamentally incompatible with legibility