Yes everyone knows the thing about how "qwerty was designed to slow typists" but everyone new to typing can pick whatever keyboard layout they want, especially those that build their own keyboards. Why are not more people choosing divorak or one or the other layouts? Because momentum is a hell of a thing. Qwerty is fine for the majority or people and the majority of keyboards sold are qwerty so that is what people use. Because it is available and that way they don't have to learn to type on multiple keyboard layouts as if they used divorak at home they would likely have to use qwerty at work or other places. The reason people still double space is that they are lazy and don't want to update with technology. I learned typing on a typewriter and was taught to double space. When I was told I didn't need to I stopped.