I'd also confirm this. Gnome started out ahead by virtue of being the target or idealization of most of Wayland's features, but it's stagnated. Nothing is ever improved and they refuse to fix the technical problems holding them back, like the lack of I/O being separated from drawing in Mutter. They claimed to have improved it several times, but it's just as bad as ever. Either they're hesitant, or they just don't have the time and resources to break and rebuild it properly.

Meanwhile, KDE/Plasma's kwin finally stepped past them. And there's also the kwinft project that's rebasing kwin idiomatically as a wlroots compositor.

We may finally get full Wayland adoption, but I don't think Gnome is going to be prominent in it anymore.