After using the Liquid Glas systems (iOS26 and macOS Tahoe) for a day, here are my observations. 

- The design is FINE. You get used to it quickly. Some of it looks very cool.
- On macOs, you barely notice it. Imo most noticeable is the extremely rounded corners of apps. Not sure I like it particularly because >50% of the apps haven't adopted it. Having 2 different corner radii windows is irritating. 
- Icons are much, much better. Better looking, more tactile, etc. 
- Biggest bug or irritant I am seeing is that the liquid glass sometimes doesn't know if it should be dark or white. 
- Clear look for icons is a cool way to beat addiction to your phone (but only the dark mode really works, clear look light has 0 contrast)
- I like that every button is a button now again. People only highlight the low-contrast problems of this new design language, but this is actually a step in the right directions. 

Will others adopt this design language? Hard to say. Will be hard to emulate these distortions on web design.

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All opinions are my own

Where they can but it will be hard to emulate this look: 

- glass distortions much harder to replicate than just a blur with web design tools 
- Google just realised their new material design version, I don't think they will do a 180 in a year or so. 
- It is hard to make transparency look good. Requires a lot of dynamic adjustments to ensure good visibility. Basically you have to ensure that your design looks good on any background content. 

I can imagine it will take at least a year or so before we see Samsung and co imitate this look. And even then, it will look more crude.

it's Apple - of course others will adopt / copy the design where they can