Comment 8 for bug 2017323

mutter = Invalid because there's nothing mutter or gnome-shell is doing to cause this.

xorg-server = Won't Fix because it's legacy software and is never going to be redesigned to avoid this limitation.

linux (kernel) = Opinion because it is the source of the 16384 limitation but that might be a hardware limit so can never be improved.

Long term we're just waiting for Wayland support to be improved for the Nvidia driver:
https://bugs.launchpad.net/ubuntu/+bugs?field.tag=nvidia-wayland

I'm hopeful the main blockers will be fully resolved within a year.