Good point Octorox and I have to agree with you Jar Jar Bricks that it could add much needed substance to Anakin’s frustration in the context of an extended edition of the theatrical movie.
On the other hand I think that their antagonism towards each other bears the movie down and should be cut or greatly reduced, because it makes both character unlikeable. I mean it is hard to think that these two are friends, let alone brothers, and this scene does the opposite of reinforcing that belief.