To clarify some points, though I'm sure all will become clear when this releases:
+ This is NOT hardware attestation. It's simply using a combination of things such as serial number and other device identifiers to prove to Apple you own the device
+ Because it is not hardware attestation, in the future this process might be improved, if someone reverses/emulates the (purely software) algorithm "proving" you have that device. Then it would only be a matter of asking the user to input a serial number, once.
+ Hardware attestation is implemented in the protocol. However, the 2019 iMac does not have a T2, so this cannot be enforced for a while yet.
+ Beeper Mini still implements the rest of the iMessage stack on-device
+ This is NOT hardware attestation. It's simply using a combination of things such as serial number and other device identifiers to prove to Apple you own the device
+ Because it is not hardware attestation, in the future this process might be improved, if someone reverses/emulates the (purely software) algorithm "proving" you have that device. Then it would only be a matter of asking the user to input a serial number, once.
+ Hardware attestation is implemented in the protocol. However, the 2019 iMac does not have a T2, so this cannot be enforced for a while yet.
+ Beeper Mini still implements the rest of the iMessage stack on-device