There's another benefit of an encyclopedia set of books over Wikipedia: in the physical process of looking up a desired topic in a book, you can stumble upon COMPLETELY unrelated topics as you flip through the pages. This serendipitous effect led to reading random encyclopedia articles for HOURS as a kid, an interaction that's hard to replicate with Wikipedia today. Sure there's Wikipedia:Random [0], but you have to intentionally access it.

[0] https://en.wikipedia.org/wiki/Wikipedia:Random