It's a matter of taste. How many verbal languages can you speak and write? Computer languages aren't special, and polyglotism is really only a hallmark of CS-mindedness, which is actually yet another form of hipsterism. It's not a real thing, and the language that is best is the language that the programmer is most productive.
That really, really depends on what the language is being used for. There are a lot of desirable qualities and features, and no single language has even close to all of them. With the vast, vast number of different programming paradigms that are effective for solving different problems, as well the various resource constraints of different computing platforms, a certain degree of "polyglotism" is absolutely necessary to be an effective, productive programmer. There's nothing "hipster" about it.
