Not really. The GNOME/GTK folks were already on the CSD bandwagon well before Wayland. Wayland compositors are free to draw their own decorations (and xfwm4 will indeed continue doing that once it's a Wayland compositor), and one of the actually neat things about Wayland is that there is a protocol that allows the compositor to tell applications not to draw their own decorations. (Whereas on X11 an app can tell the WM it will draw CSDs and the WM can't do a thing about it.)
Certainly GNOME has gone all the way to CSDs (IIRC if an app on GNOME doesn't draw CSDs, they get no decorations at all), but that has nothing to do with Wayland.
> I heard that GNOME is currently trying to lobby for all applications implementing CSD. One of the arguments seems to be that CSD is a must on Wayland. That’s of course not the case. Nothing in Wayland enforces CSD. Wayland itself is as ignorant about this as X11. [...] In fact we created a protocol (supported by GTK) that allows to negotiate with the Wayland compositor whether to use CSD or SSD.
From https://blog.martin-graesslin.com/blog/2018/01/server-side-d...
Wayland is agnostic, and it's up to the compositor and application to decide what to do while operating under wayland.
Pretty much every single Wayland compositor follows this except for GNOME, who refuse to do so. It causes problems with windows like Davinci Resolve who don't draw their own decos. This leaves some windows without any controls at all lol. But this is a tangent and purely a GNOME problem.
Don't all WMs have shortcut keys anyway?
I gave up when even normal settings were hidden and I had to use Gnome Tweak Tool, but when I upgraded, I found all my changes had been wiped.
Sure it does. Allowing windows to draw their own decorations, often in different ways and with different styles and themes, and not respecting the settings in xfwm4 as to what window-control buttons should be drawn (and where)... that's a huge UX issue.
The process drawing it's own decorations? Technical decision that both Windows (tad complicated) and macOS already do, nothing to do with UX. There's nothing stopping this model from having the uniformity of SSD (as like on macOS), but it does on Linux due to multiple toolkits which don't all agree with eachother.
Combined headerbars? UX decision.