Not to mention it feels like I've spent 3 years almost weekly explaining what this does and does NOT fix, basic asym crypto concepts over and over and over.

Asking normie users to manage their passkeys in any granularity is wildly stupid and UX folk just can't grasp that the best "management" UX is "wipe out all my passkeys and start over plz" and refuse to grasp that a user base that is incentivized to share credentials will have 15 "iPhone" passkeys they can't tell apart. 🙄