Did you read the rest of what I wrote? I'm not saying that deep focus on a narrow set of skills doesn't have benefits, and perhaps the word "stupid" was a poor choice of words. Of course focus on specialized knowledge is a "smart" thing. Expertise doesn't make anyone literally stupid, but the necessity of focus in my field and my experience has made me less effective and less knowledgeable about the world around me. I'm not coming up with excuses for not doing the hard work; I already did the hard work.