I agree. For example, while easy to learn, Python is pretty hard to truly master, due to the huge library. I guess going the polyglot route depends on how much

I agree. For example, while easy to learn, Python is pretty hard to truly master, due to the huge library. I guess going the polyglot route depends on how much time you can spend programming. If it's a full time job, it pays. If you can devote at most 1-2 hours a day, like me, it's probably better to focus in one or two at most, otherwise you will never grok any of them.