[ejona86]

If you're already a password manager user, then it sounds like your gripe is "my password manager doesn't support passkeys." That seems either a short-term issue that would be resolved in time, or you need to find a more powerful manager. It seems the browsers allow passkey providers to be pluggable already, as several third-party vaults support passkeys.

So I see your concern as more "I need to find a password/passkey manager that fits my desires" and less "passkeys require being locked into a platform."

[EvanAnderson]

I worry that people who think device attestation and not being able to backup passkey data being good things are too close to the driver's seat when it comes to the direction of passkeys. I see a possible future where free and open source passkey implementations won't be usable because relying parties will want to see device attestation.

I would love to use a hardware device in lieu of a password manager. I just need a tolerable backup/restore scenario.

[WorldMaker]

Apple is playing consumer advocate here by refusing to support device attestation keys on consumer hardware. With the large market share of the iPhone that's a key wedge that should keep things relatively open on the consumer side, presuming Apple sticks to their ideals here. The biggest advocates for device attestation are doing so for corporate "enterprise environments" and that will likely be a dividing line that corporate networks may require device attestation and consumer devices and applications won't/can't.