The point of view that Rupert Sanders takes on this issue is certainly an arguable one. While deleted scenes can allow audiences to get a sense of the movie that could have been, there is a degree to which any film is created from a director's specific choices. That vision is presumably featured in the final print/theatrical cut, and anything that didn't make it in wound up on the cutting room floor for a reason. Given how some deleted scenes can wind up being very memorable, change perceptions of a finished movie, or not come across in proper context, there's good reason not to reveal them.