As an aside, and from a non-CS person's perspective, what is the need for more programming languages? I find at least one new one every few days on HN. I've bee

As an aside, and from a non-CS person's perspective, what is the need for more programming languages? I find at least one new one every few days on HN. I've been learning Python since late 2015 and I find just mastering one language (and its libraries) overwhelming. So, what is the incremental advantage to be gained by learning yet another new language?