I'm surprised at the small number of Windows users. At my workplace every computer has Windows installed and we didn't really have a choice about it, although I never asked. Also, as a fullstack web developer, I don't really see why I would prefer one over the other, since they all support VSCode and I can write code on any one of them. But then again, I exist inside of an echochamber of Windows users so I'm pretty clueless on how development is different on other OSs.
I was surprised in the opposite direction - I thought Windows would be <5% for dev. Big, cheap contracting agencies skew the Windows number up globally, and even just in the US, but this is just HN users so I expected a much smaller representation.