Idk.. With proper use of the trigger keys, on a console controller, you can have 12 spells/abilities mapped at one time (for most RPGs) - which for me I find to be easier to work with than a keyboard and mouse. Also, I don't see how a joystick could be more beneficial just because you can play 1 handed? I don't get it.
The original NWN interface had 48 hotbar slots, each of them with a hotkey - the 12 function keys, and then those again with Alt, Ctrl, or Shift depressed.
And that's with only 15 of the 101 keys on a standard keyboard.
As for the one-handed thing, my point was that having the stick require only one hand left the other hand available to use a different input device, like a mouse, or even another stick.
Controllers are remarkably limited in what they allow the player to do, to make no mention of how they exclude players who don't have the use of both hands.