[redrblackr]

EDIT: I assumed passkeys refer exclusively to hardware passkeys, mb. My answer below means separate HARDWARE "security keys", not ones tied to a smartphone, Google or Microsoft account...

The problem here is that you are assuming one passkey. Just like you don't get just one key for your door its risky to get only one passkey, if you are planning to use it exclusively.

Passkeys are like normal keys but for your digital life. They have many benefits over normal keys like being impossible to copy/pick while still being easy to replace (as long as you have one that works) and if used properly (with a short pin-code) someone who finds or steal your key cant log in to your virtual doors anyway. They compare even better to passwords.

Just get one for your keychain and one to put at your stationary computer at home. The only thing to remember is to add both to your account(s), which still is faster than fiddling with your password manager and/or second factors.

Passkeys are really amazing, the only thing(s) remaining is to stop confusing people with terminology, explain that you should have a pair and for services to start properly using the keys as a combined first+second factor with a pin (which you can have safely the same on all your passkeys, in contrast to passwords).

What do you mean not cross-vendor transferable? You can use any brand key that properly implements the protocol (fido2/webaunth), and replace them with any brand key. If you mean copy them, well yea that's kinda the point..

There are plenty of ways for recovery on reasonable services, sometimes they ask to set up way to many (and with multiple passkeys, recovery is only relevant if you loose ALL of your keys).

Just want to point out that if your missus had a pair of passkeys there would not have been any issue!