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Funny thing ... OpenBSD did Xorg privillege separation ages ago. Too bad that lazy Xorg devs care only if you are a big software vendor, like Canonical.
Or am I getting it wrong? even if they [Xorg] get this idea recently ... well, it's better late than never.
One of the OpenBSD developers has become the leader of the Xorg Development ... I forget his name, and cannot seem to find it with a quick google.