It's when I want to use a non-systemd, no-DE environment that xdg-stuff becomes very annoying, but that's usually because applications assume a certain setup rather than any fault of xdg. eg. Wayland is very stupid about requiring a certain xdg setup to run at all.
Gnome has done an amazing job at this, I agree. You don't even notice this issue.
It's when I want to use a non-systemd, no-DE environment that xdg-stuff becomes very annoying, but that's usually because applications assume a certain setup rather than any fault of xdg. eg. Wayland is very stupid about requiring a certain xdg setup to run at all.