NaviMap is a response to our age of information overload because our human brains are not designed for handling so much information simultaneously. Think of it like the handheld electronic calculator that we routinely use for doing sums or better still, the abacus. Not for numbers but ideas.
I have found research (this is one of many) providing evidence that most humans cannot cope with more than four variables at one time. See the findings of the psychologist from the University of Queensland: How much information is too much information?