I agree, but only if you can't change your personnel package once players are on the field. Some teams have a tendency to run certain plays out of different formations but using the same personnnel package and you can't adequately address that situation as things now stand in MFN.
For example, a team might only call one or more running plays out of a certain 2-1-2 formation and only call one or more passing plays out of a different 2-1-2 formation. All the defense knows when the players trot out on the field is that they are going to use a 2-1-2 formation, but not which one. The defense then has to make any personnel changes when the players to be used in the 2-1-2 formation trot out on the field but before the actual 2-1-2 formation is revealed by the offense. Once the formation is revealed, the defense can then only audible to counter the play that it expects will be run. But it has to audible using the personnel package that the defense already has on the field. It can't change from using a 4-3 defense to a Nickel defense because it doesn't have a 5th DB on the field (it could theoretically change, but at least one player on D would have to then play out of position).
In MFN, in order to accomplish what I am describing would require a more sophisticated regimen allowing coaches to game plan against certain formations as opposed to only personnel packages. I'm all for that. But jdavid might think differently.