The iPad as it stands fits the needs of some professionals. Viewed in a jobs-to-be-done framework, there are some jobs for which many will find it the best hire, but these tend to be all of a kind: They are performed by a single application with a narrow scope, such as a note-taking app to brainstorm or a marine navigation app to pilot a boat.
I really like the above passage. The idea that what makes the iPad great is how good it is at just one application. That said, I don't agree with much else Miller has to say. While I don't think the iPad Pro will be for everyone, I bet it is for most people.