You're exactly right. Many normal users are "single issue voters" when it comes to OS choice. Linux could be the best operating system in the world, and Windows could be flaming trash that will drain your bank account and shoot your puppy, but if the user has an application that's important to them that runs on Windows but not Linux, they will always choose the "shoot my puppy" choice because at the end of the day they just want to ruin that application.