In the context of all the conversations about the new iPad Pros replacing Macs, I found these paragraphs from a Daring Fireball article last year very compelling. John Gruber writes:
But put software development aside. I think the bigger problem for the iPad is that there are few productivity tasks, period, where iPad is hardware-constrained. Aldus PageMaker shipped for the Mac in 1985. By 1987 or 1988, it was easy to argue that the Mac was, hands-down, the best platform the world had ever seen for graphic designers and visual artists. By 1991 — seven years after the original Mac — I think it was inarguable. And the improvements in Mac software during those years drove demand for improved hardware. Photoshop, Illustrator, Freehand (R.I.P.), QuarkXpress — those apps pushed the limits of Mac hardware in those days.
That’s just not true for iPad. The iPad is a terrific platform for casual use. I think it’s better than a MacBook for reading and watching video. It’s great for casual gaming. I know plenty of people who much prefer the iPad as a tool for writing. Not because iPad writing apps are more powerful, but rather because they’re simpler, less distracting, and easier to focus upon. None of those are compelling reasons to upgrade an older iPad for a newer more powerful one.