Yep. We've seen bugs with different window managers so WebRender is only enabled in Gnome in 84 to minimize the risk of breakage. This restriction will be removed in subsequent releases.
Also, we have it enabled in nightly and beta for many more configurations already :). There are many bugs to fix, but we're working through them. This is the exact same treatment we gave Windows and OSX in previous releases this year.
I know the usual rational about users blaming Firefox and yadda yadda but I am rather not convinced this is how things should work in the open desktops. If there are clear bugs in other environments, file them and break them if necessary. The only potential exception I can see is when it's not clear if it's a bug or not..
Perhaps just by default, or a miscommunication. FWIW I’ve had WebRender force enabled on Sway (Wayland i3 clone) since FF 78 or so.
Yeah, that seems odd. I wonder if the update doesn't help/involve Weyland people, and if GNOME is an X11 holdout? I haven't been paying enough attention to know.