Vay is still the best iOS RPG in terms of controls

So many great JRPGs have been released for the iOS, but in terms of controls Vay still remains the only one so far to get it right for the iOS, even though it isn't the best among them in terms of gameplay or storyline. While many others like Final Fantasy, Chaos Rings and Crimson Gem Saga try to render a D-pad or joystick on screen, Vay makes use of simple touch controls to navigate the map, you simply tap to where you wanna go, and double tap to run. You interact with objects by simply tapping on them when standing next to them. Why hasn't anyone else did the same simply beats me