This is definitely a feature I've also thought would be useful to have in DNS providers. I've worked on managing thousands of (sub)domains and the administrati

This is definitely a feature I've also thought would be useful to have in DNS providers. I've worked on managing thousands of (sub)domains and the administrative overhead of changing the TTLs for everything manually would be considerable. I'd certainly like an automated way to say "These records should gradually increase TTL up to <X> time over <Y> time" (e.g., gradually raise TTL to 2 days over 2 weeks if there are no changes). There are downsides to high TTLs though: (1) you need to remember to preemptively lower them ahead of any planned changes (if you want those changes to take effect quickly), and (2) you can't change the records quickly in an emergency. But, fortunately, lots of record types are ones that you probably don't need to change in an emergency -- and for ones that you do, you can use a low TTL. Anyway, I'd personally like to see automated TTL management as a feature in DNS software.