[ruslan]

I would expect CDE (or NsCDE).

[LeFantome]

It is not designed to be “retro”, like a toy. While it prefers many older, simpler technologies, it is designed to be used.

XFCE is much more functional than CDE.

[yjftsjthsd-h]

I'm pretty sure CDE is available, it's just (sensibly IMO) not the default. Listed in https://www.tribblix.org/Use/5.desktop.html & https://www.tribblix.org/overlay-cde.html