You didn't really explain what was wrong with using Windows.
Don't be like, "Jesus christ, and he is using Windows !? WTF." without explaining why using Windows is insecure, and how the other OSes you claim will be any better.
Don't think that because you're not using Windows you are secure. If a well-funded entity wants what you have, they will get it.
Schneier, IMHO, is paranoid for no reason. I'd lay a wager that the US government cares very little about him or his air-gapped systems (lol). He just wants to be heard.