A top harness will help keep you upright after a fall.
It's not a big deal for a rock climber because he/she is facing the rock and you can also anticipate when you're about to pop off a rock and go flying, which gives you a second to prepare for a fall.
A hunter is more likely to fall unexpectedly and be facing the wrong direction to stop themselves from smacking in to a tree. Any extra control like a top harness to set you upright will be a help, especially for folks that don't climb and aren't used falling like that.