Passkeys seem to make it harder for you to backup your own private keys to other devices or to paper. Is there an open source Passkey manager yet that allows importing and exporting?
And that I can sync to my other devices. I currently use one of the several keypass managers on my laptop and on my Android devices. As a matter of discipline (not to lose password) I add passwords only on my laptop and I send the db to my mobile devices with syncthing. I don't want to create a new passkey for each site on each device, so syncing is important. Manual export import doesn't work for the same reasons that manual backup doesn't work.