- most of the close look examples are on very simple buttons with a single geometric shapes, like ">" or "□". Those will be legible even in pretty extreme conditions, and we can't expect real world applications to be mostly composed of those.

Imagine the screen at 11:51 with a "Select" as the button text instead of the geometrical icons. It wouldn't be great.

- text is only presented on very low contrast areas. When scrolling the elephant picture around 9:30 to show the title go dark -> light for instance, it's a switch between a very pale background to a very saturated one, and they stop the scrolling when the title is against the darkest part of the image, where it's the most legible.

It's not just the implementation IMHO, in a real application you can't adjust every screen and interaction to only hit the best absolute conditions to make Liquid Glass look good. The whole idea behind it is just harder to look good in real world, short of giving up and going for very low transparency.