In case you're claiming the original author thinks either theory in general or LISP in particular is useless I urge you to read the essay. He's very much for hi

In case you're claiming the original author thinks either theory in general or LISP in particular is useless I urge you to read the essay. He's very much for high level languages, theory included, it's just that as a systems guy he's not in a position to use them.