That and email protocols are outdated and aren’t too secure. For example:

• Neither SMTP nor IMAP have no way to use two factor authentication.
• Spam blocking is so hard because SMTP was not designed with it in mind.
• SMTP has no way to do end-to-end encryption which is why you need to layer things like GPG on top.

IMAP has a modern replacement in JMAP, but it’s not widespread. SMTP is practically impossible to replace since it’s how email servers communicate with each other.

The “solution” has been for companies to make their own proprietary protocols and apps, for example the Gmail and Outlook apps combined with a Gmail or Microsoft 365 account respectively.