i want safari, mail, and messages tyvm
Get rid of vertical integration, and the software job will be given to someone capable.
Lets say I create a new GPU IP core, i give it to a third-party chip manifactorer to produce it, then that delivers it to a fourth-party to burn a privat key into the fuses, then a fifth party signs its firmware with that key, which contains checks that Windows is running in secure boot mode with Microsoft keys. And then it is sold to the end user via a distributor, which did't do any other work on it.
How would preventing a 'vertical' integration forbid that?
I would rather just regulate that users should be given the full specs and possibility to use their own keys, to allow them to run their own software on/with it without any feature gates to the hardware. This can be argued for as a right to repair or as giving devices a second life and thus reducing electronic waste.
Your rule would likely make the work of smaller companies and startups more difficult, if they have to hire a third-party to write the software. A solo dev might has to create two companies in order to create one product, that seems painful. I guess a lot of OSH projects would not be possible with that rule.
We already do this! HP didn't write Windows, but they sure as hell sell laptops with Windows preinstalled.