That's a major benefit of numerous older desktops.
XFCE is one of my own fallbacks (I usually prefer WindowMaker), though fvwm, twm(!), the boxes (open-, black-, flux-, hacked-, etc.), tiled WMs, etc., are all perfectly serviceable.
Some may look* vaguely dated, but tend to be rock stable and blazingly fast.
I'm not sure what window manager was on AIX in 1991 on an RT. Maybe it was twm. That is the first time I used Unix / X11.
When I started college in 1993 our default environment was mwm but I quickly switched to vtwm and had a really cool setup. I switched to AfterStep because I loved the NeXTSTEP look and used that and WindowMaker for 10 years before moving to XFCE.
XFCE is one of my own fallbacks (I usually prefer WindowMaker), though fvwm, twm(!), the boxes (open-, black-, flux-, hacked-, etc.), tiled WMs, etc., are all perfectly serviceable.
Some may look* vaguely dated, but tend to be rock stable and blazingly fast.
XWinMan is still live, I find: <http://www.xwinman.org/>