[p_l]

Ah yes, security through magic fairy. To their credit, at least they went with "you can't break security through nonexistant feature", except a lot of those features tend to be critical for open desktop.

D-Bus is still way more problematic to work with than DCOM. Even on the operation model (something that generic libraries will always have hard time papering over).

As for the X11 extensions - no Linux distro (at least on open market). Because XFree86/X.Org != X11. In fact, XFree86 was essentially lowest common denominator, using with little change a design that wasn't specially good back in 1992. Even if glamor helped some of it, it was more a bandaid than rearchitecting the server (which could have been done without changing protocol).