It gives me a sickening feeling in the pit of my stomach to see so many miners, the backbone of the Bitcoin network, using Windows as an OS.
it should sicken you much more to see some of the hodge podge "rigs" people are using to provide the power to the network. Some of these are unsuitable for even simple hardware testing and people are running 1000W through them 24x7 and have 4 cards at 80C+ without any worries
The hardware is much more alarming than the OS choice.
The reason that does not bother me as much is that a hardware failure would necessarily be localized, but security vulns have a history of propagating rapidly through Windows.