It’s the same principle as accessibility. We are all poor programmers sometimes, just as we are all impaired in various ways at times even if we don’t have a disability.
The problem good developers have is that they develop software people want to use, and software that people want to use eventually requires more help, and once you need help then it is inevitable that you will need to bring poor programmers into the mix. A good programmer may respect the beauty of Haskell, but it isn't a practical option for them.
Ironically, only poor developers have the luxury of being able to choose something like Haskell as they never have to worry about building something anyone else wants to use.