Love seeing this. I'd be interested in seeing how much more could be shaved off by doing things like offering an xcb/xlib shim that moves more functionality to

Love seeing this. I'd be interested in seeing how much more could be shaved off by doing things like offering an xcb/xlib shim that moves more functionality to the client side (e.g. server-side font support are trivial to move client-side) as a means to deprecate features on the server side that most modern X11 apps don't use anyway.