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Who needs more than one language?

One language is all we need? Who needs Assembler or C or LISP or HTML or CSS or Bash Script or Python or Perl??? WHO NEEDS THAT?

SINGLE STACK!! /s

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They (kind of) have a point though. I agree you should aim to be polyglot, but a particular project may not afford the learning curve if the dev doesn't already know the best stack.

For example, I'm working (part time) on a relatively simple backend server for a nonprofit with a tiny budget and short deadlines. I know I can do it cheap and fast in Python, and it will work "ok". Go would be better, and I'd like to learn it, but I'm uncertain I could pull it off in time.

EDIT: Then again, it looks like I could realistically learn enough Go for this project in a weekend. Only problem is there could be data analysis, I know good libs in Python, don't know how hard that would be in Go.

Well, it's certainly not something that needs to be avoided at all costs but in the long term it can be less efficient and more costly.

It depends really, there is no single true language (except LISP) to solve all problems in the entire stack.

All hail LISP.

My main problem with LISP is that I stopped liking Python after learning it.

Diversity for a richer ecosystem.

"/s"

[End] Sarcasm :-)

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