And since many programmers like myself had to learn Haskell, I think Haskell should have a better head start and be in a better position, if it would be so useful for "real world" use cases.

But please don't take this as an attack on haskell. I have nothing against the language, or its users and I did not suffered because of it in university, I am just curious on the appeal. Because I love clean solutions, but I also want to ship things. So part of me are wondering if I am missing out, but I so far I see not much convincing data. (But I am also mainly interested in high performance and real time graphics and haskell is really not the best here)