There are exactly three nice things about passkeys.

1. It forces the use of keys with a reasonable amount of entropy, and the use of a password manager to access them. 2. They will not make it easy to use a key with the wrong site (also true of a good password manager). 3. Uses public/private keypair so key itself is never sent over the wire (even encrypted).

The real question is whether these properties are worth all the costs (enumerated in this article).