if you say that there is no email and then you do the opposite, it doesn't make much sense. Nostr is a way to teach backup key, signature key, cloud store key, cold key
Discussion
To me it's the same as not your keys, not your bitcoin. Not your keys, not your Nostr. It's about that first step into Nostr that people find 'hard' or cumbersome. Why not make it easy until they know what they're doing instead of spamming their nsec in global?