I guess it really depends on how one choses to define general public, probably an assumption has been made that everyone has their own personal device.

> Built-in password managers are great for this. But they’re not universal (e.g. I believe using Apple Passwords on Mac doesn’t carry over to Android.

1.Only security keys (single device credentials) are what you can use across the device not the regular platform based one

2.Browser based password managers do provide you with that interoperability across the platforms and in fact the password manager as an supported passkey authenticator allows you do the same