The only use case of XQuartz for me is the ability to ssh into a Linux server with X11 forward so I can remotely control the GUI app running in the server. That’s why I ask whether Noah would be good replacement for such purpose.

I agree with you that Mac users are persnickety about UI. In fact, one of my complaints on XQuartz is the lack of retina support. As for wayland, as far as I understand, it does not support network forwarding (yet?)