I don't think this has worked well in quite some time. Maybe not ever in open source land. IMHO, widespread use of Xlib lead people to believe that X was much

I don't think this has worked well in quite some time. Maybe not ever in open source land. IMHO, widespread use of Xlib lead people to believe that X was much more synchronous than it is, and discouraged people from using networking, and then a lot of stuff that could be possible didn't get made. xcb is a much better way to interact with X, but it may have arrived too late.