All informative posts, thanks!

Another question I had, is that I see the Apple rumor mill has it that there will be an updated Ipad Mini sometime in 2019. Suppose that actually happens. Is the Ipad Mini a viable size, at about 8", for reading PDF's or larger docs? Or does that not have quite enough screen real estate? It seems like the magical dividing line in terms of "sufficient screen size" for most people on PDFs and more complex docs or graphics is about 10" minimum.