mycelium on Nostr: The passphrase is an ephemeral addition to the seed, never stored by the signing ...

The passphrase is an ephemeral addition to the seed, never stored by the signing device or "wallet". The reason most wallets do not present this up front is because it is very prone to user error, unlike the seed itself, or less so with the seed itself since the wallet stores it on the secure chip and can therefor be recovered later.