Why isn't Xwayland just a Wayland client?

[Joseph Burt]

On Thu, Sep 7, 2017 at 1:17 AM, Carsten Haitzler <raster at rasterman.com> wrote:
>
> It is CSD in Wayland for Wayland clients, unless somehow compositor and client
> negotiate something else. In the default case, if a client does not decorate it
> will not get any decorations (titlebar and so on) at all.

IIRC that's not specified in the protocol, just what Weston does, and
there's no negotiation protocol. Am I wrong? That might be a hole in
Wayland, but not really related to Xwayland, so I guess off-topic
here.

Cheers,
Joseph