I think you're absolutely right - my worry is that while passkeys are very usable, they also effectively create inescapable inertia and friction to ever changin

I think you're absolutely right - my worry is that while passkeys are very usable, they also effectively create inescapable inertia and friction to ever changing browser or device ecosystem. Today there is no migration path from one MacOS WebKit browser (Safari) to another (which also has an implementation of PassKey), since the third party browser can't share the same authenticator key. As you say, all of this is far too complicated for an end user - my suggestions to avoid the problem and migrate only work for tech savvy users that know every site they use. That's maybe 0.1% of users. My worry if we see adoption of passkeys is that only 0.1% of the browser market becomes contestable, as everyone else is stuck locked into their incumbent browser with no way to enroll their new browser's passkey into the sites they use.