When the River sounds, water bears. And when some say the engine change in the rules of the maps do not see clear at this stage of the film is exactly for what he commented from Renault yesterday: that's almost better to leave things as they are, because it will affect differently than many teams. And it is not clear how to standardise things when it comes to the truth, because by power, it can be detrimental in a comprehensive manner the different cars.
For Renault not only is the prohibition on changing the engine setup of maps between classification and career, but that addition is that the prohibition of the blow from Silverstone (or drastic change in the percentage of blown) can first cause loss of adhesion aerodynamics (the goal of the FIA) but may have unpredictable consequences in the overall car balance. I.e. that you can find one with a balanced today, for tomorrow become an uncontrollable bundle of nerves.