I don't think it's the responsibility of the author to make any constructive input to the passkey problem. The point of the article is to show the valid shortcomings of this technology that a bunch of companies are attempting to force on users.

My workaround to allow passkeys to be reasonably usable is to use my password manager, just like the author of this article. This makes passkeys essentially the same as passwords.

At no point am I tying account access to a device, or series of devices, as this is ridiculous and unusable.

Passkeys as encouraged by the big companies are all about vendor lock-in than security.