alt Hacker NewsI hate passkeys because they're always tied to a specific account or a device like a phone. I hate being dependent on phones/devices. That being said I know they solve a lot of problems so....
I still prefer a good password written down in a paper book, with multiple methods of 2FA. But I know there are attack vectors for that.
Syncable passkeys are a thing which the OP addressed. Apple, Bitwarden, and other password managers all implement syncable passkeys. In fact, I just did an upgrade of my iPhone 15 Pro Max to an 18 Pro Max and all of my passkeys came along with the upgrade.