The problem with Haskell is that it's a language built on lazy evaluation and nobody's actually called for it.
![[[Two people are conversing.]] Person #1: Code written in Haskell is guaranteed to have no side effects. Person #2: ...because no one will ever run it?](https://imgs.xkcd.com/comics/haskell.png "The problem with Haskell is that it's a language built on lazy evaluation and nobody's actually called for it.")