Yes. There are a lot of books, say "business" books, that properly fleshed out with examples and context are longer than any magazine is going to publish. (Lots of the oft-quoted concepts like Crossing the Chasm fit into this category.) But they could easily fit in something like 20 to 75 pages. However, publishing economics--which still broadly apply--dictate something like a 250-300 page work.

With my last book, I expanded on a couple areas in a new edition and I feel better about the overall information density. But in the original, I definitely felt I was padding here and there to hit a page target.