Hi Garth,
Thanks for submitting this idea.

The reason this option is offered on manual terminations is because an operator is able to make a decision about whether the DNS records should be retained. An automated system could not make such an informed decision, so we'd be looking at a blanket always on/off option. It was felt that making this available as an always-on blanked option might cause more problems than it would solve.

If others feel differently, then we'd love to hear that feedback here on the request.