My acreage here near Volcano is in a natural state, with virgin forest and a good deal of natural topography. There are many peaks and ridges and holes to be found, with a vertical relief of perhaps 10 feet. Obviously many zones that require sensitivity the needs of various plants to flourish and it is easy to make mistakes. The major food staples of taro and sweet potatoes do very well here indeed--and to have one's nutritional needs covered with reliablity is more than many can hope for.
The main advantage, however, is this--you don't screw up the ecosystem. There is no clearing or machinery involved, and if one were to cease production within a decade, for certain, the site would return to a natural state. This is no small thing and far more responsible and low impact than many "green" concepts out there. Of course yields are not as high, hypothetically, as they might be with a cleared lot and flat ground--but neither are the infrastructure needs. The vast majority of fertility and composts come from the site itself in a proven sustainable manner--the ohia trees are excellent soil builders--and with careful culling of limbs, thining, and utilization of biochar the whole makes for an uniquely viable system.