> Windows just works seems to fuck with nonWindows clients so Enterprises disable it via Group Policy.

well I've seen most enterprise networks with no IPv6 support. (mostly admins thing that this beast is hard to work with) Also Kubernetes has limited IPv6 support (mostly on the documentation site) (of course it's easier to support a IPv6 only cluster, because heck you wouldn't really need BGP or some wierd overlay networks (sadly it still is not there yet)).

In Germany IPv6 within "Deutsche Telekom" is just good. But sadly on the consumer side you still won't get any fixed IPv6 (due to privacy concerns!)