A GUI feature I read about in 5: menus were going to have a colorized band that followed through all the menus and submenus. It seemed like a feature that would really help with complex software, but of course never saw the light of day. To this day, drilling down to deep submenus quickly becomes user abuse. It wastes a lot of time to have to drill down to something only to have all the menus disappear because the mouse tracked off the submenu accidentally.

It was also just cool to have a GUI mounted on a Unix like os - which wasn’t Linux.

Nowadays though I’d like to see some Plan9-isms adopted instead of cloud stuff. I think people would benefit from being able to make their own user experience that was kept more or less unchanged and the same files and preferences available on all of their devices. I’d also like to be able to “mount” processor/memory hardware from networked machines and delegate processing to them and output results to the local GUI. Like tunneling X but without actually needing to pipe the whole user stack - just the compute input/output.