Re: I must have missed the change in standards bodies.
> In the public internet, sure. But they have zero right to enforce any rules about it at all in a private network they don't own.
Then don't use a domain name you do not own. Your own domain and .local are both good (if not interchangeable) choices for intranet name resolution. A random domain that you think sounds cool and did not exist five years ago is not a good choice.