I installed the iOS beta and thought it was as bad, if not worse than the WWDC demos. In a lot of cases, text becomes outright unreadable. Control Center looks like a mess with all the transparency.
Like the grandparent I'm much more excited by Material Design 3 Expressive.
In Vista/Win7, they mostly used glass background for parts of the window that didn't have any text on them. And for the few exceptions where that wasn't the case (like e.g. window titles) they added a kind of halo so that black text would always contrast with that regardless of what was below the window, or else just significantly darken the glass and use white text. All for obvious reasons.
Looking at the new iOS screenshots, I'm surprised that those reasons apparently aren't obvious to Apple designers.
There's some instances of text illegibility that seems to be caused by buggy contrast detection and I think they'll probably fix that pretty easily since this is only the first beta. I think the readability concerns are really overblown.
Like the grandparent I'm much more excited by Material Design 3 Expressive.