You could have shared a bit about your background with these languages. What do you know about Erlang, ML, Haskell and Lisp?
I love Lisp. It is superior language for real devs. But I also recognize that it will never work for newb programmers and the reality of corporate IT is that most devs are newbs or effectively newbs, not spending more time to level up as they think they know everything programming or are just not interested.
For these people, Java, is a way to get paid for writing boiler plate code without getting much done.
* Skyrim
* The F-35 flight control software
* The Mars Curiosity rover
Your turn.This tool is better misses the point.
If you want a quick mvp maybe Ruby is a better tool than using Haskell.
Mediocre means average. If the average developer can solve the problem in java maybe your favorite language isn't needed. The fact that a language has low adoption means it is missing features or late to a crowded market.
Or it may have the wrong features. It may even have "better" features, but not the right features. (A Formula 1 race car has lots more features than my Toyota Camry. I wouldn't drive it to the office, though. Unsurprisingly, Camrys have higher market share that Formula 1 cars.)
Your Camry probably has: 1) cruise control; 2) electric windows; 3) windows!; 4) airbags; 5) air conditioning and heating; 6) indicators; 7) headlights; 8) sound system; 9); 10) quiet exhaust; 11) way better pollution control; 12) way better mileage; 13) seats 5......
Though ride quality would be appalling, and there's nowhere to put the girls.
The actual programming language is like the least interesting part of almost all development. It is but a tiny part of the whole system that lets us build and maintain software in teams. There are some people who really want to develop in a specific language. These people tend to lead with "we program in haskell" or "we program in lisp" in their recruiting emails. That's fine for some people but its not interesting to me. I care a lot more about the stuff around the programs.