No part in particular - I don't disagree with Zef or the people he quotes. But the entire article does have this "look, all these smart and influential people are ditching $THING for Go, you should too!" feel to it. They're ditching stuff for Go for the particular kinds of problems that Go is good at. This is a subtle but important distinction that Zef isn't making, so I figured it was a useful addition to the debate.