I have the same Mail and same Mobile Number since I was 14, just using aliases and forwards if a use case arises.
E-Mail is never decentralized, due to the protocol restrictions. It is a distributed system of which you can always be locked out. Google has a massive Monopol on blacklist management as far as I can tell. You're account has to hosted, an E-Mail Server needs to be reached, a DNS has to be used. Those Web3 Mails are mostly just selling you E-Mail aliases and rebranded access to a big DNS provider.
There are Darknet web Mailer with decent protection and they are immune to DNS problems, at least mostly. There's even a Dark Net Protonmail version.