I'd think most of IoT interfaces have some form of user-definable configuration. So most of the time it should be possible to make DNS user-configurable (hidden

I'd think most of IoT interfaces have some form of user-definable configuration. So most of the time it should be possible to make DNS user-configurable (hidden in some "advanced settings" area). Of course, it might lead to some more support calls eventually and requires a little more money (as in paid work) to implement, but you'd be playing nice and have a balanced compromise of default-hardcoded-DNS with an option to appease power users and/or orgs+corps, and you'd also avoid angry-me calling your support hotline and ranting at your people :P