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Passkeys do *not* do that. I use 1Password to manage my passkeys and they are all synced across all my authenticated devices where I installed 1Password.
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You can choose either if your password manager supporte Passkeys
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Of course. I was just pointing out that their claim about the lack of portability across devices was untrue.
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Perhaps they should’ve said platforms. Because if you wanted to migrate those passkeys off your password manager and into a different platform like Apple Pass or Google how is that accomplished?
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1password and KeypassXC both support passkey syncing across devices and operating systems.
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Until service providers ban them for being insecure — "if you can send your passkey to any other device, you can also send it to a phisher."
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I put my passkeys in my password manager and it works fine.
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I keep all my passkeys in 1 password. So magical
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    it's one password to everything
You are entirely mistaken. Passkeys involve a third party storing a public key on their infrastructure, while you hold the private half of the key, somewhere.

Passkeys are never reused. Even for the same person, they are always unique across websites, and across devices.

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