Keyboard layout doesn't matter for typing speed. There are endless videos on YouTube of people typing 90+ WPM with two fingers. I use Dvorak at home because it's more comfortable and I hope will prevent RSI in the future. I keep my work laptop in Qwerty because sometimes other people have to type on it. I switch between both layouts with ease. My Qwerty typing speed is slightly slower, but that has not had material impacts on my work. I much more enjoy typing in Dvorak. Everything in this article is a non-issue, and for the biggest reason for switching, preventing RSI, he admits, "it might be worth a shot."