While I agree that this is strictly worse than current document and eBook formats meant for computers, this inarguably not much worse than physical books. We couldn't have copied quotes or table of contents in a physical book.
Other people would put book darts or little sticky notes in their books or dog ear pages where they've highlighted the quotations.
Photocopiers have existed for quite a while.
but, still, I agree that the idiom of the device is made worse in this context.
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.