Why do people find it so hard to see ...
Why are people finding it so hard to see that Tablet devices and PCs are two different classes of device, and that many folks will use one of each (plus a smartphone making three).
Apple gets it. That's why the UI on an iPhone is not exactly the same as on an iPad, and why the UI on an iPad is not at all like the UI on an iMac.
Touch devices are for data consumption, for output-mostly usage with small amounts of clicking and even less typing. There are some business applications that fall into that category. For these, going to tablets makes sense. I recently visited a sofa shop where the salespeople all had iPads. They could show you what any sofa would look like with any fabric, and then take your order while sitting on the sofa. Neat! (Pity the sofas were crap).
But for serious data creation you need a keyboard and/or a precise pointing device (mouse). For many classes of serious work you need multiple windows open at the same time nxet to each other, or overlapping. For 6+ hours/day working with the computer, you need a big vertical screen and ergonomically acceptable keyboard and seating. A company that expects staff to work those hours on a tablet, will soon be sued by staff suffering from RSI. (And even if they don't sue, productivity will be way down and "sickies" way up).
Two different tools. Why does Microsoft and half the rest of the world think that they should be forcibly merged? It's possible to build an amphibious car, but most people know that they need a car, or a boat, or both.