And often the ui is conveying sophistication and has not much content. Which is the opposite of what you want in a usable ui. That's why they look so cool and nothing like our regular uis.

There are some exceptions, like in the film "her".

That is also the reason many filmmakers like to put the ui in the air (holograms) or on glass. It looks cool on camera and you can have the actor plus the ui in the same shot.