That’s not a good reason to do this. If you really wanted to do it that much you could just modify the real parts and that isn’t really a thing that happens anyway. What’s a far bigger concern is giving one company complete control over whether you can repair your own phone or not, creating a monopoly where they can charge whatever they want, and they might not even do it at all because they’d prefer you to buy a new one. This is actually happening to the average person, these theoretical attacks that serialisation doesn’t really protect against aren’t
Maybe you don't hear about it because it works and so no one attempts it
By the way long ago I got a screen repaired at an unofficial place, on an old iphone, and camera started working incorrectly (focusing issues etc). I kinda suspect they swapped the camera for a different one, if the phone warned me immediately that would have been cool. I heard many similar stories by the way.