For me, what has been most noticeable is his shifting focus. When he started out, he mostly wrote about Lisp and programming languages. Now he primarily writes

For me, what has been most noticeable is his shifting focus. When he started out, he mostly wrote about Lisp and programming languages. Now he primarily writes about startups. Since I'm a lot more interested in the former than the latter, I've gradually stopped reading his newer essays. (Usually a paragraph or two is enough.)