mbarulli on Nostr: "The user doesn't have to worry about losing a private key and can jump into using ...

"The user doesn't have to worry about losing a private key and can jump into using your app."

Could you elaborate on how this could work?
If the private key is used to locally encrypt user data, how could the user recover from the loss of the private key?

Or, if the encryption key is derived from the user's login credentials, how does Private Key Management allow the recovery of a private key?

Many thanks!