The reason I love books from Neal Stephenson, William Gibson, Charles Stross, is that, for me at least, they're massive catalysts to my own thoughts and imaginations of what might be possible. If I had to pick one book above others from Neil Stephenson it would be Diamond Age. I just keep going back to it. It's got a lot to say, and I wouldn't mind seeing a similar analysis by the Author of this post.
I was all in to Diamond Age until the ending. It felt like he ran out of steam, gave up, or had someone else write the ending it was such a departure from the rest of the book in pace and perspective. I'll have to revisit it to see what I missed.
One of the dividing lines I have personally for "good" versus "bad" art is whether or not it blooms or withers upon further thought. Diamond Age, I would say, definitely rewards the reader for further thought, because it's a deep and fascinating world with interesting characters and stories. True, the ending of the book doesn't provide complete closure, but to be honest if you want that you can have it just by making up your own ending. That's part of the fun of that book, is that it leaves it open for you to fill in the blanks afterward, and seemingly things looked like they might have worked out alright for Nell.
One of the best books at getting across the concept of not needing complete closure at the end of a book is The Fault in Our Stars by John Green, though that book primes the reader for it whereas Diamond Age doesn't.