Modern computing has focused on presentation style to the detriment of actual usability and functionality.
TWM and Unity accomplish the same goal: Launching programs and managing windows. But the TWM binary is 171KB and TWM runs great on a 486. FVWM’s a little bigger (825 massive kilobytes), but it’s also significantly more configurable that TWM or Unity!
Here’s a very functional looking website displayed in a browser from 1992: