pfSense

There is no reason why two separate host-override systems should be used. It only serves to make managing a lot of overrides more painful.

(1) The host-overrides should exist in a global position within the configuration file and not specific to the dns resolver used.
(2) Managing overrides would be made much easier to have a single host-override screen regardless which dns resolver is enabled. This would make switching dozens or hundreds of overrides between the DNS providers much easier.