Pah! I think they should let everyone chuck, with the stipulation something like the ball has to come from above the shoulder or vertically outstretched elbow. It would look a bit weird, but the straight arm thing simply means spinning is less effective and merely a sideshow to the fast game. The chucking thing is too tough to detect. The umpire won't have the balls to do it there and then, the trial by TV replay isn't accurate, and it must be easy enough to replicate a safe action under testing to get through the tests.
Would be great if it was a bigger part of the game, especially as most legal spinners are rubbish!