The nuance being that:
- alterator-setup package would change default.target
  for systemd providing a symlink of its own and making
  a backup of what was there (rc3 basically);
- 40-x11-autostart would ignore that backup;
- 99-oem-setup would do nothing about it all either;
- alterator-setup removal would restore rc3 symlink.

It's not pretty either, something more robust should be
invented some day.