Earlier quoted context omitted.
The same argument is made for not adhering to the XDG spec for user configuration files. The result is you have no real sense of specific locations for config files, shared static data, and app-generated data. If an app follows the spec you know exactly where to look. Otherwise it’s anyone’s guess. I’ll admit this is less of a problem in project dirs, since tooling usually confines itself to a single file. But toolin…
Do you know about the pyclean tool?
git clean has options to only clean ignored files, which generally does what you want. I could see there being weird situations where a file is .PRECIOUS (in make's terms) or where you have a file that's ignored but not a product of the build (a developer-specific config file?) where this doesn't work, but I haven't run into that yet, and it's freeing to not have to maintain a free target by hand.