I feel as if Vista is the best comparison.

XP is sort of like Fisher-Price for Windows, but is usable. Vista ... was something else.

Liquid Glass on Mac is sort of like a terrible remix of OS X Aqua.

And frosted glass elements on iOS have been around since iOS 7.

But note how the blurred/frosted background is a background and doesn't conflict with the icons on top of it.

Note how the designers of Liquid Glass failed to learn from this.

https://www.cnet.com/reviews/apple-ios-7-review/

I really liked Windows XP. Do you mean Vista?

exactly my thought. I never made it to Vista. In 2007 I changed WinXP (always used it with the classic grey theme) for OS X Tiger on a MacBook and never went back to Windows since then.

I wonder where a decent alternative will be lurking in the next few years? Apple is losing some grip, but all others are still worse overall.