This is fantastic. My feedback would be to make the bunker step optional/advanced. I could easily see a normie being utterly confused and/or intimidated by it and bailing.
Say hello to Nstart, Nostr's onbarding tool!

Nstart aims to guide new users to Nostr offering a easy and no-nonsense onboarding wizard, with useful hints about the protocol and some really exclusive features:
- Easy local backup of your nsec or ncryptsec
- Email yourself your ncryptsec, as additional backup location
- Create a multi-signer bunker URL for Nostr Connect (more info below)
- Auto follow the contacts list of some old and trusted Nostr users
- Customize of contact suggestions, useful for onboarding friends & family
Try Nstart live at https://start.njump.me or watch the video below to understand how it works.
A note about the multi-signer bunker. This is really cool stuff made by nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6, that uses FROST to split your nsec in 3 (or more) and distribute each shard to an independent trusted remote signer. This will give you a bunker code that you can use to log in to many web, mobile and desktop apps without exposing your nsec. If you ever lose your bunker code, if the signers vanish from Earth, and it stops working, or if it gets stolen by a malware virus, you can use your nsec to create a new one and invalidate the old one.
More info and source code: https://github.com/dtonon/nstart
Enjoy it and send back any feedback!
https://chronicle.dtonon.com/77b9a397cbbcd63f3bfc78ff2b2c0607e4ffa698a1fad33ab4736593c8ad4f90.mp4
Discussion
Thanks!
I know, it can be a bit intimidating, but I believe that bunkers (perhaps in more compact forms) will be the future way to access every Nostr app, so I want to expose them as soon as possible, to see how users react and thus improve the UX.
My feedback. I think the main issue is with double dipping on two separate narratives. With nsec bunker, you don’t get the benefits of the keys. It’s a reversion back to username and password. But you do get other benefits with that. So just pick one or the other. Presenting both just shows the annoyances / cons of both.
With this solution you actually get both benefits: you own the keys but you can use a safer and revocable login token that is "semi-custodial" (all signer need to collude to steal the nsec). Of course the user need to understand a new paradigm: keep the may nsec safe and just use the derivated token(s) to login or sign.