Shameless plug: I am the author.
Are you saying that you don’t want to write your software according to the XDG spec, or that you don’t want to set the XDG env vars on your system? If it’s the second that’s fine - apps using XDG work just fine if you ignore it. If it’s the first I’d suggest reconsidering because XDG can make things much easier for users of your software who have system setups or preferences that are different from yours; and using XDG doesn’t cause problems for users who ignore it.
OP’s recommendation is aimed mostly at software authors.