password managers generate a unique password for each website. this means if one of your passwords leaks it won't compromise any of your other website logins.
nostr-login is a regression: if you leak...
lud04 handled that well. A new private/pubkey was derived by the wallet for each domain you logged into.
Since an npub is more like an identity than an identifier if you have concerns you can generate or
derive a new npub for each site you log into.
Since an npub is more like an identity than an identifier if you have concerns you can generate or
derive a new npub for each site you log into.