I get the users are just looking for ways of doing thing they like. Many won't know what features are available elsewhere. Sooner or later they will start grumbling about it.

And then expect Zuck and his henchmen, to come up with retarded round about ways to provide the features. "We pay close attention to our cattle. Our new AI based cloud OCR can identify upto 40% of all words on a single page! You can even copy and paste some of them etc etc".

I personally don't like reading books on the Kindle or Phone but do find the bookmarking/lookup/navigation features very useful and of course the ability to store a zillion books. Given all those advantages expect some Facebook exec to start drawing up master plans.