In a way, you're letting people see the nature of things that you read - from which they might glean the nature of your thoughts, and privacy is something we all value. For that reason (and since I don't have any particular sentimental value for books, only their contents) I've long since preferred a digital library. As a minimalist, having a single Kindle on the table is aesthetics enough for me, which is complementary of the minimalist viewpoint as well.
However, I completely agree with the fact that having a physical library is a very conducive environment for kids to grow up with. I remember fun memories of my childhood reading from the home library, and thinking how pretty and colourful the shelves were too. But I think there should be a distinction between cultivating a library for your kids, versus that for the observation and assessment of strangers.