Kindly Note that, many solutions being used on the internet today both huge and small at one point began as a hobbyist project and others as one man show, but through the support of community and a large organisation, they eneded up becoming mainstream and extremely large projects with advanced features functions, and a proper milestone.
WHy does Cpanel have its onw interface for DNS management, WHy is NEthserver implementing its own Interface around OpenWRT and its own features.
Overall none of the Opensource solutions would be 100% feature complete but with a little nudge, they could become larger.
In My View BIND DNS is a better DNS solution, but it lack severely in interface, but it resolves the fastest works the best and is more resilient, while powerdns, has a better interface. it depends sometimes with which is easier to work with, which requires the least effort, and what would offer better ROI.