"Your app should run on windows. It only runs on [not windows]? Downvote!"
"Your app runs based on technologies that mean you could easily port it to windows. But it doesn't run on windows? Downvote!"
"Your app runs on windows, but it's built on technologies that allow it to run anywhere else; why does it only run on windows? Downvote!"
See the pattern? Saying "I don't like your entire contribution because it doesn't run on a given platform on which I think it COULD run" is counterproductive and at best pointless; at worst rude.
"Your app runs based on technologies that mean you could easily port it to windows. But it doesn't run on windows? Downvote!"
"Your app runs on windows, but it's built on technologies that allow it to run anywhere else; why does it only run on windows? Downvote!"
See the pattern? Saying "I don't like your entire contribution because it doesn't run on a given platform on which I think it COULD run" is counterproductive and at best pointless; at worst rude.