[This question](https://aviation.stackexchange.com/questions/42513/would-a-helicopter-with-the-blades-on-the-bottom-fly-the-same-if-at-all) has several great answers showing that it's perfectly possible for a helicopter to fly with its blades underneath the rest of the aircraft.

There are some obvious issues with having a helicopter's blades at the bottom, to do with proximity to the ground and being in the way when someone wants to get in or out of the helicopter. Is the answer that simple, or are there other reasons related to flight dynamics, manufacture, or something else?