Offset creates arrow spin. Fewer degrees of offset means less spin. More offset means more spin. Spin creates stability to some extent. A lot of arrow spin at short ranges can be good, but at long distances, that same spin can actually destabilize the arrow. So you might want some arrows with a lot of spin and some arrows with less, depending on where and what you’re hunting. Arrows naturally spin in different directions coming off different bows. If you want to match the natural spin of an arrow, it’s good to be able to adjust between right and left.