I don't doubt that Nadella is likely every bit as shrewd as the CEOs that came before him, and that his decisions are driven by ulterior motives that are more than what meets the eye.

However, shrewdness is just one trait, and I think it's disingenuous to insist that we can reasonably ignore all other consequences of having a different human being running the company because their shrewdness makes them as interchangeable as planks on a wooden boat.

Personalities and management philosophies can't be reduced into some simple measure on a shrewdness scale, and the other differences between these real human beings that you don't seem to be taking into account can and do bring real change in how the company behaves and operates. Maybe not a lot of the change is concentrated on the axis that you've cherry-picked, but that doesn't mean we can dismiss all the other change that may have resulted from this change in management as "next to nothing".