I learned Dvorak 30 years ago due to RSI, and it's a pain for reasons 2 and 3. Maybe 10 years ago I just dropped it and went back to Qwerty. Got RSI, switched back to Dvorak, fixed it.
But speed is just a matter of experience. I don't know if I'm faster on Dvorak, but a speed that is really hammering keys in Qwerty feels comparatively effortless in Dvorak.