It's easily observed that a fielder's arm is important to the shortstop and second baseman positions and that throwing accuracy is important to these and third basemen too.
But I have noticed little impact in catchers, of their having a much better than average arm, compared to an average arm (maybe the same with throwing accuracy).
And I have seen no difference that I detect, when it comes to outfielders' arms and accuracy.
Has anyone collected any data that shows any differences, there?
Would be interesting to see.