I personally appreciate the knowledge and experience I've had from using different languages, libraries, and implementing different projects (personal and profe

I personally appreciate the knowledge and experience I've had from using different languages, libraries, and implementing different projects (personal and professional). I also think this is pretty sound career advice. That said, being a professional Clojure developer, I was surprised by Rich Hickey's advice on mastery [0], and think he likely has a point. The happy point is probably the classic 'T' advice - lots of broad experience with different languages, paradigms, etc., with enough deep, deep experience in one or two to be incredible at reasoning and execution. [0] Could only find this gist - https://gist.github.com/stijlist/bb932fb93e22fe6260b2 https://gist.github.com/stijlist/bb932fb93e22fe6260b2