Hopefully work on DWD can start progressing. Maybe that is the best way of trying to encourage compromise.
A DWD GTK implementation might be the way forward for solving this but until there is something substantial done I will tend to side with gnome tbh.
They have been attempting to do a lot of work modernizing the stack in the 3.x release and resources are stretched far enough.
I don't think you should take it personally that they prioritize their own desktop and platform over others.
DWD looks promising, pursue it, hopefully they join you.
Also don't see the problem with what Ken said about recommending that users use applications developed for Plasma.
You have your own HIG, your own way of doing things and concepts, embrace it.
Recommending that users use application x over application y because it integrates with Plasma better is perfectly fine.
Hopefully in the future Gnome and KDE can cooperate more on stuff but I don't see that happening if there is always a presumption of malicious intent.