[pseudalopex]

Many standards refer to other standards. The XDG Base Directories specification is for any software on any Unix like OS. Git supports it. So does GLib. Bash and OpenSSH should. The GLib user directories are Desktop, Documents, and so on. The specifications do not conflict.

[GuB-42]

It looks like Git supports it since 2015 and Bash and OpenSSH apparently don't as neither contain the string "XDG_" in their binary.