They can go that way, because the technology is far enough. A traditional automatic is not suitable for sporty driving. Not only because it may choose the wrong gear at the wrong time. In racing, the balance of the car is highly important. Making an uncontrolled shift within a corner, can spin off the car because of the associated weight shift. You counter that in traditional transmissions with double clutching and heal-and-toe, where you get the rev in the transmission about right, to guarantie a smooth shift and a stable car. Ferrari and the like managed through timed automated gas bursts and other technologies to conquer the effect in automatic transmissions.