To me it looks more like Windows Vista's "Aero" than OS X's "Aqua".
This was posted in another HN thread about Liquid Glass: https://imgur.com/a/6ZTCStC . I'm sure Apple will tweak the opacity before it goes live, but this looks horribly insane to me.
But I'm not so sure if I want transparent.
I remember the catastrophe of Windows Vista, and how you needed a capable GPU to handle the glass effect. Otherwise, one of your (Maybe two) CPU cores would have to process all that overhead.
They are heading in a good direction, it just needs to be toned down. But like any new graphics technology the first year is the "WOW WE CAN DO X!!!!" then the more tame stuff comes along.
Why do you think they are headed in a good direction? There is literally nothing I like about the liquid glass effect from a usability perspective. The transparency/translucency is wholly negative in my opinion.
The best analogy to me is physical buttons in cars vs. touch screens. The "headed in a good direction" there is to actually stop putting more shit into the touchscreen and have physical buttons for anything you'd touch while the car is in motion.
Maybe this is consequence of the Frutiger Aero trend, and that users miss the time where user interfaces were designed to be cool instead of only useful
Usability feels it has only been down since Windows 7. (on another hand, Windows has plenty of accessibility features that help a lot in restoring usability)