Some are. Look at the similarities between UIs in these movies and today’s Space X shuttle navigation UI:

https://www.shanemielke.com/work/spacex/crew-dragon-displays...

There was a trend if I remember correctly, over the 2000~2005 period. Back then, there was some futuristic UIs like gkrellm, some audio players like winamp and a few themes for Windows to make it look cooler.

Because they're silly ;)

Because real GUIs are designed to be useful.