That's entirely appropriate imo - system packager should be running pip or whatever and then putting the output where it wants, it's not for setuptools or whate

That's entirely appropriate imo - system packager should be running pip or whatever and then putting the output where it wants, it's not for setuptools or whatever to declare that. What path would you put in setup.py anyway? A different one for different distro preferences, a different one again for Windows, for macOS?