One thing I never understood about this passkeys thing is: how will the passkeys database be kept in sync between your iPhone, your Windows desktop, your Linux laptop and your Android tablet? I've tried to research the topic a bit but everything I've been able to find has been about exporting and importing between ecosystems, but most people don't use only a single company's products.
The passkeys are only synced across Apple devices, via iCloud keychain. Trying to sign in on another device (e.g. Windows laptop, Android phone) will require scanning a QR code. The devices then establish a secure channel using FIDO caBLE v2 (introduced by Google/Chrome, I believe) to perform the authentication. This ensures the passkeys never leave your Apple device, but can still be used on other devices. You can s…
I'll keep using passwords, thanks.