The only rebuttal I can think of is this:
iOS apps optimized for iPad: over 1 million.
Windows apps optimized for Surface: don't know, but far less than a million.
I highly doubt people who run devices like Surface Pro care about millions of stretched out phone crapplets when they can run professional software like OrCAD, SolidWorks, ANSYS Mechanical FEA, etc. They can still run phone crapplets on their phone so the iPad Pro is a redundant tertiary device.