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My understanding is that it is not GTK as such, or XInput, it has to do
with the GTK folk not telling the X11 for Mac (XQuartz) folk what input
they need to make it work. XQuartz actually has some support for pressure
and tilt, but it does not seem to work with GTK.

To quote Jeremy Huddleston:
"It doesn't actually have much to do with XInput. XInput has more to do
with direct access to the hardware. We have Quartz between us and the
hardware, so it doesn't make sense to actually implement XInput.
Tablet support is partially implemented in 2.3.0, but there are some bugs
with it that I can't debug because I don't have a tablet (I loaned mine to
Ben, so hopefully he'll be able to take a look at these issues).
Additionally, GTK doesn't seem to like the way we send information about
pressure, tilt, etc to it, and nobody over in GTKland has responded to our
questions about tablets in X11, so we're mostly waiting for a GTK developer
to step up and point to what they need from us."

A question of communication in more ways than one, it seems.

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Apple's X11 does not have Xinput support. Does XDarwin have
Xinput? Even if it does you would still need a driver for
your tablet that supports it. Wacom didn't even reply when
I asked if they would support this.