My ~/.config gets quickly littered by dozens of my dev apps.
Another problem is conflicting names. ~/.config is a system-wide namespace.

I propose to add a sAppNamePrefix variable in addition to the sAppName.
If it ends with the slash, then it will be a folder. (I propose to make it "upp/" by default)
Without the slash this will be a regular prefix. "upp" -> "upptheide", for example.

If I'm shipping several apps, I can put all configs in one folder, and name it after a company, for example.