I don't even know why bound books are still a thing being made.
My phone has maybe a thousand books on it, all downloaded free, including hundreds of complete engineering reference texts with illustrations, and all this only fills about 7gb of the 96gb of storage my phone has.
I feel the ability to have every text resource on my person at all times without even needing an internet connection to get it through google's awesome book scan resource is pretty awesome.
We are already at a time where the average 12yo kid with a smart phone and interwib access has a better library than the entire bound library of congress, and all instantly searchable and available faster to access than owning like 10 physical staffed libraries.
For pleasure reading (which I miss doing a lot), I love the e-reader because the room can be totally dark. Much more immersive experience for the imagination to run wild in the dark than feeling like you're reading some adventure novel in your mind, but seeing your living room chair or lap or annoying lamp or something trying you back to reality and preventing the same level of escape/immersion I get from a backlit ereader in the dark.
I would also like to add, I own 2 android based purpose built ereaders. Both just collect dust, because my preference is to simply read on my phone (galaxy note 2), it's most comfortable and lightweight to hold and the screen is absurdly good.