Even if there was no HV curve, and the terrain underneath you was hostile (rocky, lots of trees, etc.), the lack of an HV curve wouldn't make the landng any more pleasant.
The HV curve, as presented in the flight manual, is flown (by FAA mandate by the way, not because the manufacturers necessarily want it) to a smooth, flat paved surface. it's one way to reduce the variables, but it means you have to have something up your sleeve if you're operating in an area where you don't have that type of surface in front of you.