Leaving Gmail for Mailbox.org

I wish there was something like cell phone number porting for email addresses. I don’t know how it would work on the technical side or how you could secure something like that, but the idea of switching email providers is too daunting, so I stay with Gmail despite abandoning all my other Google accounts and services.

You kinda get that with your own domain. I think that's the best you are going to get

Isn't losing your domain a huge risk for any common user?

Unless you use some sketchy TLDs, I've not heard of that

I've seen plenty of stories of people who forget or are unable for whatever reason to renew their domain names on time.