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Are you kidding? Let's take C++: Templates are a dark art, generics are confusing and ugly, and inheritance is so so easy to screw up. Python: You use inheritance or duck typing, neither of which provide you any guarantees.

Not one of those languages has a construct equivalent to Haskell's type classes.

Do you even know what type classes are? Not to mention that this article has nothing to do with using type classes.

I do. And fwiw, "It takes a true Haskell mind to take something so intuitively obvious and make it incomprehensible." is both a compliment and a gibe.

I guess most people are pessimists.

Could you please not do programming language flamewars here?

https://news.ycombinator.com/newsguidelines.html

Comprehensibility is a function of both the author and the recipient.

I find that a lot of functional enthusiasts (e.g. people who are very, very comfortable with type classes) truly lack the relate-ability to make the material accessible to people who lack the same background as them.