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Or the simpler reason is that they just knew LISP better than other languages and chose to use it.

Once they needed to grow by adding developers, they decided to rewrite into a language that other people already knew.

The only "Super Power" is the complete understanding of what your endusers want so that you can grow.

When you are writing a tiny protoype 15 years ago, any language you know is fine. But over time -- both the life of the product, and the world overall, software grows far more complex and the ecosystem matters much more.

Knowledgeable developers are part of every language's ecosystem.

Yes but ease of attracting developers is harder in some languages versus others.

No need to include the "knowledgeable" modifier.

Interestingly I have encountered voices that using "elitist" language like Common Lisp, OCaml or Haskell combined with widening recruitment pool (by going globally distributed) actually increased some companies abilities to hire experienced developers - because it filtered popular languages that suffered from higher number of people who had higher opinion of their skills than warranted - or who just wanted to "fake it till you make it", especially after boot camps became popular.

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