I wholeheartedly agree with this blog post. I believe someone on here yesterday was asking about config file locations and setting them manually. This is in the same vein. I can’t tell you how many times a command line method for discovering the location of a config file would have saved me 30 minutes of googling.
I wasn’t sure if it’s a standard or not, but a bunch of stuff store config files there. At least on one of my command-line-only systems, I see configs for htop, NuGet, ookla speedtest, PowerShell, rclone, and borgbackup in there, as well as an empty procps directory. Apparently it’s part of the XDG standard, but it seems like a decent number of non-desktop apps use it too.