With FOSS I don't have to spend time trying to figure out how to remove the latest unwanted crap from my start menu or taskbar. I don't have to spend time figuring out how to remove the telemetry crap. I don't have to set my default browser back to Firefox after every major update. I don't have to click through popups about new features they want to promote or telling me how I can waste even more money by subscribing to their cloud services. I don't have to lose work because it decided I didn't update often enough and just forces a reboot without my approval. No, I can just work on it and it will just do what I want, not what Microsoft wants. That saves me a lot of time.