GTK development is almost entirely led by people involved in the GNOME project. From my understanding, members of other GTK-based desktop environments have not

GTK development is almost entirely led by people involved in the GNOME project. From my understanding, members of other GTK-based desktop environments have not tried to become maintainers themselves to help drive the direction. Elementary as a consumer of GTK seems to be fine with most decisions. Inkscape and LibreOffice don't seem to care either. All Cinnamon, MATE, and XFCE need is a libxapp similar to libadwaita which provides the design language that is common between those desktop environments. No one seems to have started on it though.