For personal projects, you can pick whatever language you want, possibly the most fun one that is still practical. Haskell or Elixir look promising in this rega

For personal projects, you can pick whatever language you want, possibly the most fun one that is still practical. Haskell or Elixir look promising in this regard. For companies, there are more factors to consider, eg. finding devs at a correct price, getting existing workforce to work on a new tech, size of standard/open source library, getting help and bugfixes from community instead of hacking on your own, risk of language/tech losing steam, etc. That's why several comparatively "boring" languages still thrive.