You make a good point. I have a proclivity for the Kindle app overall, for the same reasons. While I am attached to physical books, my Kindle device, Kindle Cloud, as well as the Kindle for Ipad, the latter folds in the features of the best readers and adds value to your experience. Especially, if you truly enjoy turning your reading experience into the a thesis experience. You can see the parallel between author and content. My favorite feature is the dictionary. I am curious about the etymology of specific words. Helpful intel for the crosswords.
I do not think it will ever replace the assortment of books I keep on my desk for ADD reading. I read a few selections at a time. I also enjoy the Zinio app for periodicals.
Thanks for starting this thread @foxy