Like others said, fighting the clean HOME fight is just draining and futile in the end. This script helps you identify low hanging fruit, though, where you can change their storage location with a simple envvar.
I have my home directory mounted via NFS, which has worked marvellously since gigabit ethernet became cheap 20 years ago but lazy/ignorant developers are making it less pleasant every year.
I've used xdg-ninja. And it does feel futile. Which is why my original comment comes across a bit more as frustrated/exasperated bug report than an HN comment.
Right now everything that xdg-ninja finds are all things with a .prefix and hidden. which is whatever. if this was ~/.grayjay, I probably would have rolled my eyes but not even bothered to comment. I'm not a stickler about XDG, but I am a bit of a stickler about not cluttering my home directory.
Like others said, fighting the clean HOME fight is just draining and futile in the end. This script helps you identify low hanging fruit, though, where you can change their storage location with a simple envvar.