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Apple are committed to iOS as the touch screen operating system, the rules for apps are tailored towards touch screens. That's why the iPad Pro offers something very different from a touch screen laptop running OSx. I'm not sure you could combine the 2 or say that one outweighs the advantages of the other. Maybe a laptop with a touch screen that runs both iOS and OSx would render the iPad Pro redundant.
Apple isn't missing out on the boat with the touch screen on a laptop, I don't think. If they put a touch screen on their laptops, would anyone still but their 12inch ipad pro? I doubt it. I am pretty sure this is the reason why they do what they do. Of course Apple has the tech to put a touch screen on their computers. In fact, turning an iMac screen to a touch screen has been possible for a few years now via a 3rd party company. I can't remember the name, but I was going to set up my own studio about 6 years ago and had a very long chat with a business guy from Apple and the touch screen tech was already available with the Macs at the time. Whilst not directly offered by Apple, they would have been able to set me up with this 3rd party company. The price was also very reasonable too.