The rock was a poorly implemented, visually discontinuous addition whereas the Greedo shootout is indeed much less objectionable in the 2011 Blu-ray. The fact that they now fire pretty much simultaneously allows for the interpretation that Han intended to shoot first, but Greedo got off a shot. Not a dramatic character difference from the original in my opinion. I can totally understand why a weird rock face which appears in a good half dozen shots would be a more jarring than a split second cut during a shootout.