A couple of problems: (1) This resolver has security bugs which have been fixed in the existing daemons. That doesn't matter except that: (2) systemd utilities get an easier route into distros than competing utilities, even where the competition is much better or more secure. This really matters since Linux improves because of the Darwinian nature of the competition between the different components. You can't have one group of packages claiming they are the "one true standard", or this doesn't work.