I'd distinguish between an address one can
choose to dispose of in an organized way versus an account you don't want to lose access to.
I have my own domain, and pay a hosting company to manage the e-mail, which means it's easy to have ton of forwarding-only addresses for different purposes.
This means that I register with mybank123@domain, if that ever leaks I can log in with them and change my e-mail to a new forwarding-address of mybank456@domain. Then retire the older one.