I don't think they would which is why the low level toolkits like SDL are the ones that have to handle it. Unfortunately that's the way it is, libwayland is very barebones and doesn't have a way to draw decorations.
>this is not the only case where gnome devs just decide to be jerks.
Please do not assume bad faith and suggest that someone is being a jerk to you personally because they didn't implement a feature that you were interested in. This is a sure fire way to cause burnout and stress to open source developers.
>wlroots and sway developers are doing good work to try to bring wayland and its tools to same level as X11, but then we have these other groups that just actively reject anything that doesn't go along with their "vision".
I have seen wlroots and sway developers reject patches and features that don't go along with their vision too, so I am not sure what distinction you're trying to draw.