Yeah, they could've hit Monad Transformer Hell, or they could've wasted all their time learning how to write practical applications in Haskell and end up bankrupt in a very lovely ivory tower.

I've heard this argument over and over again and it never is good advice. It ignores the context completely as well as whether the developers know Haskell or not.

You can screw things up in any language, especially if a large part of your business model involves stuff not related to code, like shipping perishable food.