No offense, but you haven’t unscrewed/screwed enough flathead screws if you don’t see why they’re worse in every way. The criteria for a good screw isn’t that you don’t have to have the correct tool. The bits are $0.99!

I unscrew a single screw and whether it’s a light switch or an electronic device, I’m already annoyed. Even if you use a flathead that fits perfectly, it will un-center and slip out, whether you use a hand bit/screw driver or a drill.