If you buy a phone, add it to your iCloud account, then the phone becomes broken in a way you want to salvage the camera/battery, presumably removing that phone

If you buy a phone, add it to your iCloud account, then the phone becomes broken in a way you want to salvage the camera/battery, presumably removing that phone from your iCloud account (which I don't believe requires the phone to turn on?) would allow you to use those genuine, not-stolen parts in another repair.