Because its making him into George Lucas 2.0. Just because Nolan can write and chooses to shoot his action, doesn't mean he should necessarily do those things. Someone else's screenplay and a true 2nd unit would work wonders for Nolan, I honestly believe. But as it stands now, he's made WB so much money that no one is going to step in and say "hey Chris, your writing is far too on the nose and kinda shit". Hence the Lucas comparison - film works best as a collaborative medium, not with one unopposed person making all creative decisions surrounded by yes men.
Studio support and creative freedom is fantastic. I fully support that. Just saying that there also should some checks and balances along the way. Inception for example could have had one rewrite of Nolan's original script by a better writer, and had its action scenes shot by a seasoned 2nd unit director, and been a much better film for it.