The only exceptions are NeWS and NeXTSTEP (OS X derived from it anyway).
Everything else are just clones of other desktop OS, with GNOME and KDE trying as good as they can, while dealing with such clunky stack.
From: npg@East (Neil Groundwater - Sun Consulting)
Date: Wed, Jun 27, 1990
Subject: Humor from Dennis Ritchie (at USENIX)
(Actually Dennis's latter remark was attributed by him to Rob Pike)
from Unix Today 6/25 page 5.
"..., Richie reminded the audience that Steve Jobs stood at the same podium
a few years back and announced that X was brain-dead and would soon die. "He
was half-right," Ritchie said. "Sometimes when you fill a vacuum, it still
sucks."