I'm not suggesting that if you don't do this that you are doing it wrong. Remember that this would be the best, ultimate, optimum arrangement and is predicated on requirement not capability. So let's talk about application and some of the other considerations that come into play. In general the room has a lot to do with what type of speaker system will best work in it. Difficult acoustic spaces require much greater attention than spaces that have well-controlled acoustics.
Small rooms are different than large rooms.
The shape of the room will make a great deal of difference in what approaches work and those that will not. Let's look at some of the highlights. In rooms that are deep rather than wide the visual soundstage for music is narrower. In those cases a full bandwidth central cluster will most likely be sufficient to reasonably support the music program without distracting displacement of the musicians. Voice reproduction will be optimum with the best point of focus and articulation.