No, actually, proponents of Python or R don't generally claim that all statically typed languages are useless in practice. In fact I don't remember any evidence

No, actually, proponents of Python or R don't generally claim that all statically typed languages are useless in practice. In fact I don't remember any evidence of that. Also there doesn't seem to be any evidence that dynamic typing is detrimental to programming. And I don't see all non-computer-science-scientist-programmers learning Haskell any time soon.