[destructionator]

> All the rendering happens server side, and bitmaps are sent over the wire. It's basically a crappy VNC.

Even if this were true (which it isn't), there's a lot more to a GUI than the G. A lot of nice interoperability is provided too, like clipboard integration, dragging and dropping, mixed windows on the same taskbar, etc. Far more pleasant to use than awkwardly going to a full screen thing to get a window out.