Trying to prevent theft that way is a fundamentally flawed approach. It's in the end all about controlling the phone you brought to prevent you from using it in any way they don't like or using it longer then they like (by repairing it).
Theft will happen anyway. You can even sell permanently-locked/bricked devices to people which doesn't look to closely at the sellers description. Sure you will need to sell them for cheap, but that's all.
That idea is like saying all cars must be always tracked, always link up with the drivers phone and be remote-controllable by there manufacturer to prevent theft.
Sure it would prevent theft, maybe, until people find ways to brake it. But it's still totally unreasonable with a lot of hidden cost to it.
E.g. in case of apple laptops the cost is losing a lot of small independent companies as well as any way to properly repair an Apple laptop. (Apple doe NOT provide proper repairs they at best replace whole components often the whole main board because it's one component when many damages tend to be similar because people use their devices similar and often are reasonable fixable with a bit of not-easy-but-not-very-hard-either soldering).
EDIT: And most important! The theft constraint can be archived to a reasonable degree WITHOUT locking out third party repair. A example (through not applicable to mac in this case) is how I setup my laptop with a custom EFI platform key/certificate and a BIOS password so to reuse it after theft people have to replace the BIOS chip soldered onto the motherboard (it has no publicly known master key or reset pin). Apple can archive similar things so that theft is more costy but third party repairs are still mostly unconstrained.