Fun fact, it'd actually be illegal for Apple to disable devices if it detects a replacement part. There are anti-trust laws against 'tying agreements', and for

Fun fact, it'd actually be illegal for Apple to disable devices if it detects a replacement part. There are anti-trust laws against 'tying agreements', and forcing consumers to only buy components from Apple (due to tie-in) would be violating those laws. That said, those laws don't say anything about having to interoperate with an inferior part. So assuming Apple isn't willfully violating anti-trust laws, we can be fairly sure the change was intended to improve some aspect of the touch controller. Note: There are exceptions if the tying serves a purpose other than maintaining a monopoly (such as the security pairing between the TouchID sensor and FaceID camera).