"... the language makes almost no difference in actual productivity, it's just personal preference." If that were true how can we explain the results in this p

"... the language makes almost no difference in actual productivity, it's just personal preference." If that were true how can we explain the results in this paper http://www.macs.hw.ac.uk/~trinder/papers/ICFP2007.pdf http://www.macs.hw.ac.uk/~trinder/papers/ICFP2007.pdf which compared writing the same large application in Erlang, Haskell and C++ and showed the C++ program needed 40 times more code than Haskell and concluded: "The high-level constructs dramatically reduce application size, thereby reducing development time and aiding maintenance."