This is why you (1) keep a local backup and (2) never ever use shady registrars for anything important. Hopefully you have learned from this and you regularly backup your email from Google in case your account becomes inaccessible for whatever reason.
I think the main worry about losing access to email is not losing access to your historical archive of email messages, but rather your sudden inability to reset passwords and recover access to other accounts.
Not to mention the risk that someone else takes possession of said email accounts and domains, in which case they essentially own every account you have that's bound to that email.
The archives can be quite important, I frequently have to reference my email history for one reason or another. If I temporarily cannot receive new email, it’s not such a big deal as long as we aren’t talking about hostile account takeovers. But mostly I use self-hosted services so even that wouldn’t be the end of the world. It would be annoying to deal with, yes.