Feature parity matters, especially if adoption is a goal. I'm not sure Gnome cares about adoption, but since they're on the back foot, and if they're wanting to increase adoption, it'd be in their best interests to have feature parity so that supporting Gnome does not require extra code to support entirely different UX paradigms.
I personally love Linux, love Gnome, and, when I'm not paid, I only use these platforms. However, it is incredibly difficult to justify spending time on workarounds, and it is emotionally painful to see the Gnome team dig in their heels. I can't blame them for wanting to do things the way they see fit, they are a volunteer organization after all, but seeing them be actively averse to adoption is difficult.