I mostly agree with the article but for the reason that I did not see clearly reflected in it. I think knowledge of multiple languages (and technologies in gen

I mostly agree with the article but for the reason that I did not see clearly reflected in it. I think knowledge of multiple languages (and technologies in general) is important not from a perspective of trying to be an expert in many things (which I think in general is counterproductive) but because it helps one to be better (and, arguably, much better) within their domain. Few examples to illustrate my point: - Having some experience with strongly typed language makes Python developer a better and safer programmer. Compare with Python developer who is not even aware of the weak vs. strong typing issues and all the related gotchas. Well worth the investment. - Having seen the ease-of-use and power of some data structures (e.g. Python dicts) not natively available in C may suggest to C developer to look for libraries that implement something similar. 10 minutes playing with Python may end up saving countless man-days on a large C project. - Having even minimal experience with NOSQL DB may suggest to a DB admin that handling unstructured data on their Oracle cluster may not the best way to go. - Having seen FPGA latencies may suggest to a Java developer not to bother with the software that will be competing on latency. The list is endless. I guess my main point is: even approximately knowing what's out there helps you make much better decisions, where decisions may be anything from picking the right approach in your area of expertise, or picking up a different tool if you need to, or telling your boss to hire the right person, or even not starting on the task due to lack of right expertise.