Historically, that was the only option before “password protected exports” were added. – There is no real advantage of an account restricted export, but only disadvantages, so a password protected exports usually is the recommended route.
(–> Encrypted Exports | Bitwarden)
… and I still don’t understand, why the “account restricted” exports are still the predefined default… (corresponding feature request: Make "password protected" the default / predefined choice for "encrypted JSON exports")