> The vendor specific ad hoc mechanisms for extending DNS in a site local context are not well supported

DNS is one of those things that OS vendors think should be extendable and configurable. It allows VPN apps to redirect DNS only for certain subdomains, for example, which enables proper split-horizon DNS. I think this is totally reasonable behavior, and it’s undeniably useful. If a particular programming language reimplements DNS on its own, you lose guarantees that the OS is striving to provide to the user.

You can make the case that OS’s shouldn’t make these guarantees, and we’re free to disagree on that, but from a practical standpoint it is a very useful feature and it sucks that pure Go apps don’t work with it.