Where do you get that from? There are lots of practical Haskell projects that "do things": From web frameworks over window managers to cryptocurrencies, and al

Where do you get that from? There are lots of practical Haskell projects that "do things": From web frameworks over window managers to cryptocurrencies, and also many commercial projects that are all but mundane and where nobody cares about category theory. You can also check out https://haskell-lang.org/libraries https://haskell-lang.org/libraries for some pretty practical documentation on libraries that Haskell programmers use to build programs that "do things".