What if Google took your 16 year old email address? Corporate cloud is an absolute trap. A prison. You cannot trust these companies with your important digital belongings. Free, libre, open source software, peer to peer networks, and citizen run communications infrastructure are the only viable way forward if we don't to live in a rental society where none of your belongings belong to you, not even your identity.
They can take my email address, I'm keeping my emails.
Got a mail client running on several machines for that reason. All hail IMAP.
Notifying all the people I've ever sent an email to of a new address is a quick task with an offline email client.
Changing the email address on all the accounts is a bit of a chore, but that goes with (as you rightfully say) not owning that email address.
Guess one of these days I'll run a mail server just for creating online accounts. It won't even need to send anything, so no worrying about aggressive spam filters. And it can auto-delete everything each day too without harm.