Haskell's language is very sophisticated, but the tooling and bindings to external systems is primitive.

Again, I’m going to ask for specifics. I run a Haskell company so I’m not unfamiliar with the language.

Eclipse then Visual Studio Code, Tensorflow, web services. I'm sure Haskell is great for you in your niche, but someone with arbitrary interest X, who knows Java or JavaScript or Python (or all 3 together, which is easier than knowing Haskell), X likely works out of the box with those languages, but not Haskell.

I’m sorry, but I still don’t understand what you mean. Haskell has mature libraries for writing web services. That’s what I use the language for, and it’s hardly a niche.

Plenty of people (including some of my colleagues) write Haskell in Visual Studio Code.

I don’t know anything about Tensorflow (though machine learning seems a bit more “niche” than building websites tbqh), and I haven’t known anyone to use Eclipse for writing code in the past decade or so.

Genuinely, I haven’t a clue what you are talking about. How would three general purpose languages “work out of the box” with X, but a fourth would not? Eclipse is a text editor and you can write Haskell with it. There are Haskell bindings to Tensorflow available.

Your point now doesn’t even seem to be consistent with your original point. How is Eclipse state-of-the-art? How is Haskell behind?