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Modern scripting languages with... parametric polymorphism, built-in parallelism/concurrency, grammars, constraint-based multiple dispatch, etc.?

Not everyone thinks that ticking off a list of feature checkboxes satisfies the most important adoption criteria.

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True, but at the same time If I'm writing a code base that will likely have a >5 year life. I'd rather write it in a feature rich backwards compatible language. Else you are left with a Python 3 like scenario where you will have to undergo a decade plus migration path just to get a few improvements over a for loop and a print statement.

If I'm writing a code base that will likely have a >5 year life

... then don't write it in a language with negligible documentation, negligible tooling, barely-there library support, nearly zero users, and a roadmap based on the promise that, after almost fifteen years of working on the "It'll be ready when it's ready!" principle, sufficient volunteer mindset will change to "Let's ship a production-ready release to meet a hard deadline!"

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