On iOS devices you can import/export Passkeys between supporting password manager apps (including Apple Passwords).
In my experience, migrating between Apple Passwords and Bitwarden worked without issues, in both directions.
In my experience, migrating between Apple Passwords and Bitwarden worked without issues, in both directions.
The passkey provider vendors are motivated to serve their customer's needs (the end users, and secondarily enterprise deployments) over non-customer needs.
So Apple platform support (for example) will only send an attestation when one is configured via MDM. Your provisioned work device can indicate to work systems that it is in policy.
The compatibility-limiting risk, if it exists, is more likely from regulators putting their hands on the scale and pushing for security policies that would prevent synchronization and backup, and requiring attestations to make sure those policies are in effect.
The vendors could use it to enhance lock in, but for the most part the vendors all seem in agreement that the rising tide safety to float all boats of Passkeys is worth investing in making them friendly, especially to non-technical users, and to some extent try to avoid direct lock-in.