That's a very strong assumption... The only reason I have an Ipad rather than a Surface Pro, is because it didn't exists when bought my Ipad, sure thing that will be my future tablet in my next cycle, and I feel I am not alone. I think surface is not doing it better because it came into the game too late but it is a nice replacement for my heavy laptop and my Netflix viewer (namely Ipad)

Existing windows applications are by definition best suited to desktops and laptops.

Our's would be such an application but even as it is there are certain aspects of its typical daily use that might/would be best served by a tablet.

At those times it would be nice for a user to be able to switch from one device to the other and then back again.

In fact, requests like this are becoming more frequent.