I think about user interfaces frequently, usually for a few hundred to a few thousand milliseconds at a time. And my thought is: This is very pretty, and it’s not what I want.
A computer monitor is a rectangle, and everything a computer does maps to ones and zeroes which can be most compactly represented to humans by strings of text. The root of all user interfaces is displaying text in some rectangular shape. And this has been a solved problem since the 70s. (It was a small rectangle, at first.)