There's a good deal of logic to all that. But logic doesn't build great products. In fact, logic can get in the way of building them. Microsoft used a certain kind of business logic when it designed and built Windows 8, for example. It figured that it could use Windows as a way to jump-start its struggling phone and tablet strategy. The idea was to have Windows 8 have the same interface as Microsoft's phones and tablets. In that way, people would get used to the interface, and then want to buy Microsoft's phones and tablets because they used the same interface.
Things didn't turn out quite that way, for a simple reason: Windows 8 is a kludge, an unsuccessful Rube Goldberg mashup of a traditional operating system and a mobile operating system. It simply isn't a great product, or even a particularly good one.