I'm reminded of this Steve Jobs response from WWDC 1997 [1]:
> One of the things I've always found is that you've got to start with the customer experience and work backwards for the technology. You can't start with the technology and try to figure out where you're going to try to sell it. And I made this mistake probably more than anybody else in this room. And I got the scar tissue to prove it.
The beauty of the implementation I described is that it could work with any existing (web) app with little-no development effort while leveraging affordance users already have from using Touch/Face ID to authenticate Keychain, Apple Pay etc.
Until a proposal like Solid is widespread, I'd love for a browser/password manager vendor I trust (for me, Mozilla or Apple) to integrate with a privacy-forward email vendor for unique email addresses to provide a less 'fingerprinted' approach to auth, useful today with all legacy (web) apps.