Sorry but this is just crazy. I always wonder if people writing blog posts like that have ever worked in a big company. You need to spend at least 2-3 hours a day doing code reviews and most of the rest you are writing code, which subsequently involves reading the code you wrote yourself and others have written.

Now we currently use Java here. I worked with other programming languages in companies too, for instance C and C++ which were a nightmare with no equal. Don't get me wrong, when I was in college I just loved creating crazy shit with template metaprogramming and preprocessor metaprogramming. Once you mature out of it, this is just the most craziest thing you could ever do.

The reason is simple. Even plain, stupid Java is already incredibly hard to verify during a CodeReview. Spend 2 hours in a row trying to find problems with other's people well written Java code and your brain feels like it explodes. Now with C++ that same task is almost impossible and will likely require 8 hours of your day for the same code volume. With Haskell I would go out on a limb here and say it would require 24 hours of your daily time to handle the same code volume...

Not to mention that most programmers even at Google and Amazon would not even be able to either read or write such code and people like me, who could and did in the past would just shake their heads and move on. Nobody wants to deal with such code outside of university...