It is the author's fault for not realizing the real-world skills he'd need. You're not a good programmer unless you know multiple paradigms -- that's like sayin

It is the author's fault for not realizing the real-world skills he'd need. You're not a good programmer unless you know multiple paradigms -- that's like saying you're a mechanic but only being able to change the tires. And true, knowing Lisp gives insight on the flaws of Java ... but knowing Java gives insight on the flaws of Lisp.