I continued: "I'm typing this on a QWERTY keyboard." Some standard UIs are so strong that they can never be changed. The original QWERTY design was optimized to prevent a mechanical typewriter from jamming. The keyboard on the iPad I typed that tweet on was completely implemented in software. Nothing that can ever get jammed. But the original reason it was designed that way is long forgotten. It's just the way keyboards are done. There have been attempts to change the design, but they proved too unpopular. #