What I find about general-interest nonfiction is not that it's longer than it needs to be to make its point, but that its point is often shallow or even wrong.

What I find about general-interest nonfiction is not that it's longer than it needs to be to make its point, but that its point is often shallow or even wrong. Take Freakonomics. I thought it was a great read, but on reflection I think "there's a hidden economic reason for everything" is not a particularly useful observation. Indeed, it might be better stated that "there's no realm of human behavior that economists won't study." Or to take an older example, Dow 36,000: The New Strategy for Profiting From the Coming Rise in the Stock Market. Published in 1999. Or The Great Depression of 1990, published in 1985. Or consider pretty much any book of diet advice. If it was published more than 15 years ago, it's very unlikely to agree with our current understanding of healthy diet. If it was published less than 15 years ago, we haven't debunked it yet.