I think game that uses simulation is very accurate. Without delving into the offline options, the online play offers the MAs and DAs as a part of the sandbox game aspect, and for more simulated or historicaly accurate play you have the AvA, FSOs and Scenarios.
Probabley why so much reliance in the MA-sandbox is on the individual maps, as they ultimatley determine what you'll (individual or organised group) use and how you aproach a given situation or objective (which depend on the map or it's current state). This also relates to side switching too, which I'm not argueing against, since being stuck on one (loosing or winning) side/situation can severely limit your freedom of choices.