I'm not able to continue to receive mail at the apartment I lived at a decade ago. It turns out after I stopped paying for the apartment I lost the ability to control that mailbox.

This is a normal thing to happen in the physical world. We really shouldn't have such strict connections between email being a primary identifier for a user, requiring only a single one on an account, and not letting users change what they consider their primary email address. Email addresses can and should change over time. If someone really wants to ensure you have a piece of digital real estate one should get into the "ownership" game and get your own domain. People somehow end up buying and selling houses all the time which is far more complicated paperwork-wise, and yet we act like registering a domain name and configuring it for an email provider is just nearly impossible for normal people to handle.