Because a torquey v8 with a 6000 RPM rev band needs more gear intervals... yeah, right.
With the advent of "flappy paddles" Why do automatics still have joystick selectors?
It is no different than a game console controller... electronic switches.
Might as well be PRND buttons near the steering wheel rim, and flappy paddles behind the wheel.
Use the console real estate for something else.