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For most web apps correctness is not the most important thing, this is why Python and PHP are/were so popular.

What is important is flexibility, Haskell's strict typing definitely impedes flexibility so I disagree with you that it's nice for building web apps.

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The value of type safety is more that you're more productive because you can faster change things (as the compiler tells you what needs to be changed). This allows for faster iteration on your product.

Correctness is indeed not the most important thing, it's kind of a nice side effect.

Correctness is not the most important thing unless it is. Security bugs often stem from sloppiness and incorrectness. It depends on the use case.

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