With the recent distutils revert, code that was removed from distutils.sysconfig is now back.  This causes an unfortunate code duplication that raises maintenance cost (see msg116087 for an example).

Even if distutils is feature-frozen, I think that it should be changed to use the sysconfig module again.  Think about it that way: The new feature is sysconfig itself, this does not break the distutils freeze since compatibility would be retained.