This perfectly describes the current situation with passkeys.
Passkeys are a great idea--they are like difficult, if not impossible-to-guess passwords generated for you and stored in a given implementor's system (Apple, Google, your password manager, etc.).
Until passkey systems support key export and import, I predict that they will see limited use.
Who wants to trust your passkeys to a big corporation or third party? Vendor lock-in is a huge issue that cannot be overlooked.
Let me generate, store, and backup MY passkeys where I want them.
That doesn't solve the general "I don't want to have to manage my keys" attitude that some people have, but it prevents vendor lock-in.