I agree to some extend but we (or at least I) publish open source software (amongst other reasons) because I like helping others and it so happens that most use

I agree to some extend but we (or at least I) publish open source software (amongst other reasons) because I like helping others and it so happens that most users that could benefit are still using Windows so it doesn't feel right to stop doing that as long as the effort is reasonable (which it is, unlike for macOS).