Modern demands on email privacy are exceeding its original design and are still growing even more enormous. This is morbid.

Let’s take a look at some certain use case: Alice created a banking/finance account (something similar to Revolut/Paypal), and her login credential are listed below:

username: alice@example.org
password: You1-Should9-Use0-A7-Password4-Manager2!

Alice was careless, she didn’t follow the best practice of backup and lost her KeePass database (or her Vaultwarden database, or she forgot master password, or the paper that she wrote passwords on). Unfortunately, this is the only copy of the above username/password combination, there’s no way to retrieve.