I haven't adopted #PassKeys for my accounts because, as far as I can tell, there aren't really any options that let me own my private key and store it myself; they all depend on trusting somebody like Google, Meta or Apple to handle it for you, which completely defeats the purpose in my opinion. Like #PGP / #GPG, I want to own the private key so I can manage it myself. Trusting your PassKey to a third party app that's only on your phone introduces a single point of failure.