My problem with this spec is it requires Service Providers and DNS Providers to know about each other. It's essentially formalising the status quo of cookie cutter setups for big name providers.
Yeah, I read the website and the entire spec. I think it's pretty good, but it's built by big names for big names. There's nothing wrong with that, but I'm concerned it might not be appropriate for things like quickly pointing a simple A Record at a self-hosted open source service. Maybe I'm wrong. I'm having a good discussion with the spec developers here: https://github.com/Domain-Connect/spec/issues/64