Is there really a non design/art "pro" use for the ipad pro? If the pencil is exceptional--it may be the best written notes device? Absent any graphic application, I am not sure who needs/wants this for productivity.
I think I understand what you mean, and I should have been more clear. In my mind, being more productive involves more than being better at producing content on a device. It also involves using a device to perform better at providing both goods and services in other areas that the device supports.
With that in mind, I can imagine doctors using an iPad Pro + Pencil instead of a clipboard + pen. The Pro can be preloaded with reference material and patient records, and with 3D models of the human body to help the doctor explain diagnoses and treatments, as demonstrated during the iPP keynote announcement.
I can imagine corresponding uses for scientists, engineers, property developers, interior designers, field service techs, salespeople, recording artists, students, etc. as they meet with prospects, clients, partners, and leaders in all sorts of non-desktop settings for idea/sales pitching, brainstorming, problem-solving, peer review, tutoring, etc.
I think most people who type are more productive on a physical keyboard, which is why Apple offers the Smart Keyboard. And even without the Pencil and Keyboard, a “pro” might find the bigger touch screen is more helpful in demonstrations, points of sale, and any of the other uses cases I mentioned.
I believe there is a lot of potential for “pro” uses of the iPP beyond graphic/art creation (if I understand you correctly).