>>28526235
Sedans have 4 doors for practicality like most hatchbacks and wagons, but isolate the occupants from the stuff being stored because it's in a trunk. There is a booming effect you get with such a large cabin like in a very roomy wagon or SUV over rough road that doesn't typically transmit through the chassis as well into a sedan's cabin. This bank vault, luxury feel is taken to its logical extreme in cars like the Lexus LS460 which doesn't have a folding rear seat for an even lower noise floor by isolation the occupants from the trunk even more.