That argument doesn't hold water. It's best practice for offline first PWAs to not require sign up when you get started. Unless there is ever a feature to sync

That argument doesn't hold water. It's best practice for offline first PWAs to not require sign up when you get started. Unless there is ever a feature to sync across devices or cross users, there is no reason to EVER sign up, and even then, you can make signing up something they do AFTER they decide to keep using your app and realize they do in fact want syncing.