I'm thinking a workflow like,

See a nice article on #Alexandria.

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Add a zap button, an emoji button, and the ability to write kind 01 or kind 1111 and you're done. 99.99% of users will never need to login to an app again, especially if they can easily login npub-only.

Then the apps compete on having features cool enough, to make signing an event with your own worthwhile. The ability to edit and publish complex documents, play video games, use a cool search engine or API, etc.

Most apps aren't actually worth logging into, but they're so badly designed, that they're hard to use, if you aren't logged in. So, don't log in.