Okay, then why is the camera serialized and not the battery (which, incidentally, you CAN replace on the iPhone 12)?
- it's a component of the Face ID authentication scheme
- they don't want people using iPhones with sub-par camera's posting on social media
- they don't want iPhones with sub-par camera's on the second hand market
on my macbook I can see the battery serial number in System Information under the Power section and the camera unique ID under the Camera section. not sure why it would be any different on the iphone.