I don't care what everyone else thinks. I believe this has consumer protection in mind.
Here's why:
- • Most people do not realize that the replacement parts they buy online, or the parts used by the third-party repair shops are NOT Apple OEM parts. They absolutely assume that they are.
- • Even if they do realize that the parts being used/sold are not Apple OEM parts, most people do not realize or understand the differences they might experience by using a non-Apple part. Third party parts vary very significantly in quality and performance. Some are very poor and some are nearly indistinguishable from genuine.
- • Online and in person third-party repair shops can not be trusted to accurately disclose the above information. Don't believe me? Go to your local mall and ask the kiosk repair guy if the parts are geniune Apple parts. Chances are he will say "yes, or course" or something slightly more generic like "they're just as good."
To address the case of switching batteries from another phone:
Although the battery is in fact known to you to be genuine (because you literally moved it yourself), the phone does not know what you know. From the phone's point of view, it is impossible to tell a battery is genuine from the battery itself (no chain of custody / trust).
It's entirely possible for the authentication chip on any battery to be reverse engineered and identify itself as genuine, even though it is not (this has been done with lightning cables for years and has resulted in the "accessory not supported" checks becoming increasingly aggressive over time. It's also entirely possible for the on-battery circuitry to report false results for cycle count, etc.
The only way to know it is genuine and new is to "calibrate it" upon installation by an authorized technician (who as part of the process can also verify it's chain of custody from manufacturing to delivery). Even that step isn't a guarantee (if Apple's supply chain were to be compromised, this could still be a failed method).