We're clearly operating on seperate planes here. Your reasoning as far as I can tell, is your own belief, and not based on evidence that anyone can verify. My reasoning is based on Apples actions, their own comments, experiences of third party repair shops who are being threatened by Apple, and my own experience with third party repair shops.
I can never understand why people want to stop others from choosing where they repair their products. If you (not you specifically) think third party repairs are shady, well great ! you already have a choice and you can get yours serviced at Apple. We should be free to make decisions about things we own. Apple fighting to block our right is disspointing.
>But I still think it's much more likely that Apple just doesn't test for third-party repairs than that they deliberately work to come up with ways to break a third-party repair without breaking their own repairs.
There is no "testing for repair". When you replace a component on a logic board, it either works or if its sabotaged (like inkjet cartriges, kurig kcups, iphone screens), it doesn't. And thats if you're doing a component level repair. For parts replacement, it should be way easier. I get the feeling you're not very familiar with how electronics repair works. It is really nothing like software.