alt Hacker NewsIf you use something like 1Password it's very easy. It stores your Passkey and it syncs cross device. It's another thing but once it's set up it's less of a pain than using authenticator apps or having to find some random iPad that Google popped up an approval prompt on.
This is how I use them but you have to admit that this assumes 3-4 things about a user just to save them the hassle of supplying two factors at login time. It's also unclear to users if passkeys can be migrated from one password manager to another