Last point is useless, as iOS is not equal to an actual desktop operating system. There are some thing iOS does well, but actual desktop apps is not one thing it does at all.
So basically, you want a tablet to be able to do everything a notebook can do, but you don't want to get a notebook. Do you see the problem with this logic?
A MBP isn't in the same category as a Surface. But gasp the surface is still powerful enough for most laptop and tablet considerations. In fact, MBP's are consider very high end to begin with so many laptops won't be able to compare. Consider reviewing the current market and specs of other devices before continuing.
You cannot combine a notebook and tablet without compromise somewhere, whether it's cost, battery, size, weight, power, etc.
QED A Surface, even when compared with an Macbook Air, is very much so a full grade laptop as well as having stylus and tablet input. So that isn't exactly gimped.
Except that the MBA is a gimped notebook too...