There are a lot of “totally timeless” ideas, so lots of reasons to have paper books. There’s also nothing wrong with a book becoming outdated. A book is the most efficient way to transfer a large amount of information between two human minds. Just because some syntax changes doesn’t remove the value of that information being transferred in the first place. And just because a “best practice” changes, that doesn’t mean that understanding the old best practice has no value. In fact, everyone would benefit from understanding the history, context, and evolution of “best practices” (which change so often that they should really be called “current practices”).

So, if you’re only looking at a book along one dimension which is “getting the most recent fashion status” in a fast-changing industry, then paper books aren’t appealing. But that’s the saddest dimension to evaluate a book on.