I really do think you're ascribing emotion and malice to decisions where it doesn't make sense to do so.

> Shutting down iOS emulation projects seems spiteful.

No, it's because Apple "pays" for OS development by selling hardware. Emulation projects cut into that. It's not spiteful; it's a logical business decision, regardless of whether or not we like it.

> Adding code and microchips to enforce serial paring of batteries, screens and camera modules to the device it was originally installed in... is a cost cutting measure?

This absolutely can be the case. What is the engineering cost of supporting third party components?

What happens to apples image if a crucial calibration is not performed after swapping a component? They might lose that customer forever because “Face-ID doesn’t work”.

What is the cost if your PR image is damaged as a result of third party battery fires? “iPhones explode” would be the headline and third-party batteries would be the footnote.