Then I store a YubiKey which is a second factor to these accounts in another safe deposit box in another location.
So should I forget my master password: drive to box 1.
Should my house with all my computers burn down: drive to boxes 1 and 2, find a pc or phone somewhere, and I have access to all my accounts.
Should my password manager go bankrupt overnight and take my vault with them: drive to boxes 1 and 2, then click “forgot my password” on all services and use my e-mail to recover access.
Should my password manager go bankrupt overnight and take my vault with them, my e-mail provider go bankrupt overnight and take my mailbox with them: at least I have my own e-mail domain, so I can set up a new mailbox elsewhere
Should my password manager go bankrupt overnight and take my vault with them, my e-mail provider go bankrupt overnight and take my mailbox with them, and my domain registrar go bankrupt overnight and take my domain with them: yeah…then I’m screwed. I’ll migrate to a wooded country and become a hermit.
You only have to remember one password, and for that reason people can choose a longer and more complex one.
Then your passwords are encrypted using that master password.
So people cannot “reverse” your password if you pick a reasonably long master password.
For reference, my master password is a 27 character sentence which would take somewhere between a millennium and the heat death of the universe to crack. It encrypts around 500 passwords, each in itself 25-35 character long pass phrases I do not know.