The .name scenario is even worse. One domain gives you access to tens of thousands of users email. It seems like a privacy nightmare.
I’m not sure how future auth and privacy will work, but my child lost a tracfone phone and some mixup had separated it from my account. There was no way to recover the number. If that was my personal phone, how difficult would it be to restore banking, medical, and government access to things that assume I’ll always have that number.
Doing the same with personal email seems like too big of a risk.