I did some extensive testing of 4 different full body harnesses and a rock climbing harness some years ago including test falls and had one real fall in a rock climbing harness.
In a climber I only use a RC harness, recovery into a climber is a real problem for less than the most fittest hunter in a full body harness. In a hang on with sticks, steps, or ladder, a full harness is not a problem. I prefer a full body harness in an open front hang on for the fall restraint feature.
Now I always use a Treestand Wingman also.