I love my nook classic, but I do think the "poor library management" argument is fair and valid. Heck, I have 300+ books from B&N alone, and navigating the library is...tedious.
I was psyched when they implemented shelves, but the feature was implemented so poorly in my opinion (can't be managed online and sync'd between devices, adding books to shelves was incredibly tedious and slow process, no easy way to drill directly to a specific shelf, etc.) that it ended up being DOA for me at least.
I don't think it's unreasonable to want to store one's entire library on their reader, if space allows. I don't like feeling tethered to my computer, or like I have to do a lot of library management before I can leave on a trip. That's part of the appeal of mobile reading, to me - my library, ANYWHERE.