To an intutive mind, many things are obvious. But people who work on details to arrive at a decision sometimes look for details even to make trivial decisions. Many smart indivduals I have seen in academics seemed to be detail oriented people.
However I have come across situations where detail guys made a discovery and anonoused it and then intutive guys complained, "this so obvious it is not even worth mentioning and you say that this is an invention? huh.
It happens. So, when things are obvious we should realise that it may not be obvious to all. Hence obvious things need to be clearly mentioned. Yes at the other hand, so called conclusion after a detailed analysis could sometime be just ordinary.