I think you're entitled to also specifically add to your list: 3. The lack of a standardised DELEGATION_ONLY flag. work on which was being pursued in the IETF

I think you're entitled to also specifically add to your list: 3. The lack of a standardised DELEGATION_ONLY flag. work on which was being pursued in the IETF[0] (and included a little shout out to you[1]) but sadly seems to have stagnated. [0] https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-delegation-only-02 https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-deleg... [1] https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-delegation-only-02#section-13 https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-deleg...