Since you have an iPad Pro (I do, too), let me ask if you feel the strain of the brightness of the screen at all when you read stuff on it. My older eyes can't handle it for very long, so I read on an inverted black background. Even with that, I can feel my eyes strain. With an e-ink device like a Kindle, I don't experience that. Another thing to mention is that a Kindle is a devoted e-reader. If you are like me, I can get distracted by the many things I can do with an iPad Pro, which makes it harder to concentrate when I read. A Kindle is way smaller and lighter than an iPad Pro, so if you are carrying it while you are out and about, that will be easier.