I lose tons of stuff on the cutting room floor. For Scary Movie 3, for example, we had a lot of Matrix spoofs, a Hulk scene, and some of that stuff just doesn't hold up - it's too much plot, audiences just didn't want to hear about it.
The special harm attaching to prior restraint is that the government can keep materials from reaching the public, so there can be no accountability, no judgment by the people that the power to suppress was wrongly exercised.