I’m now on my fourth Kindle and am fairly proficient at annotating and highlighting with it, but hate to think about studying math or chemistry or physics or engineering with it.
With a pencil, one can mark up a page in a few seconds and get on with one’s studies. To do what you suggest in math, you’d need some kind of super-app that gave you full, quick and easy access to all of the symbols of modern math and symbolic logic. Not to mention drawing a little graph now and then, or some other diagram. But I’m unaware of any such app.
And even if there were one out there, when I’m racking my brain, trying to learn something new in math, I don’t want to stop and read the release notes for SuperApp v. 6.1.107c to do something in the margins that I could do perfectly well yesterday with version 6.1.107b, but can’t today because they’ve changed everything.
Even in the arts and social sciences nowadays, one might want to capture a bit of statistical reasoning in the margin, or sketch a quick diagram of some kind. You just can’t do that on the Kindle, afaik and imho.
Which as I said CAN be done on a Kindle You can write detailed notes and highlight and even write basic mathematical formulas. I never said you could draw pictures or intricate and complex mathematical formulas and neither did you in your example as why a textbook is better.