Apple makes an OS adapted to each hardware platform, it’s brilliant. To mash it together would be a disaster.
It's the other way around. Apple markets their hardware platforms based on the OS they allow it to run.
The iPad Pro with magic keyboard is essentially the same hardware as a MacBook Air. The major difference is that the iPad is only allowed to run iPad OS, and the MacBook Air runs Mac OSX.
Keep in mind that under the hood, all of these (iOS, iPad OS, tvOS, Mac OSX, ...) are essentially the same operating system. The primary difference is the user interface layer.
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Keep in mind that under the hood, all of these (iOS, iPad OS, tvOS, Mac OSX, ...) are essentially the same operating system. The primary difference is the user interface layer.