Remember - just a little over a decade back, Apple DID turn lose of the hardware part - licensing the OS to 3rd party makers.
The lesson learned by Apple - it nearly killed them.
Now, with OSX, that game might not be so deadly for them, I still believe that experience is still in Steve Job’s mind.
In Steve’s mind... in the board’s mind... in the shareholders’ minds... in the users’ minds...
Basically, it’s never going to get repeated for as long as Steve or any of the long-term boardmembers and shareholders have anything to say about it.
A crippled edition was released to third parties, and only those who would only make Apple clones - bad bios chips, bad copies of the OS, it was a disaster by Apple's own choice, and people continue to buy the koolaid that only Apple can make an Apple.