The problem as I see it is that you need to adopt to what consumers want.
I don’t think Jobs would have been pleased to the point of being publicly dismissive of Microsoft Surface 3. Unfortunately the market has spoken clearly on this and loves full PC functionality in tablet form with a stylus and full keyboard.
While it’s debatable how many people are using Illustrator, Photoshop etc on mobile devices you can’t get detail out of your fingers.
The mobile market has blurred too much between productivity and consumer media consumption that options and needs once thought impractical or unnecessary are now practical and necessary.
And for those who use those Apps, there have been styli available since 2010. They work quite well. For even more control, there are pressure sensitive styluses. that broaden the width of the stroke and with a click of a button on the stylus, change that from width to intensity of the stroke. They are available for prices anywhere from FREE (my office gives away pens with stylus tips) to over $300, depending on functionality. Apple is most likely not going to include a stylus when the vast majority of customers will not need one. Those who do, will purchase the one that most nearly meets their need. One size does not fit all.