I think that the length of a hunting bow has 2 factors to ponder. What can you shoot accurate, and what are the conditions you hunt in?
Longer bows in general, tend to be more accurate and forgiving of shooter errors in form. Hunting from a tree stand, or any downhill shooting can have some issues with the bowstring and heavy clothing with longer bows.
I have shot a 70" longbow out of a tree, but that would not be my preference if tree stands are the prime method of hunting. You have to be aware of your set up and "dry run", so there are no surprises when opportunity presents itself.
When still hunting in heavy cover many prefer a shorter bow. Ground blinds, especially tent blinds, tend to need a shorter bow.
Can you shoot the bow accurately under the adrenaline of a hunting shot? This is the 2nd consideration. Some people can shoot great with shorter bows. Some cannot when under adrenaline. Howard Hill could not shoot a short recurved bow well enough under hunting conditions, and returned to a longbow of ASL design. There are much better designed shorter bows today and the options are many. Overall mass weight of the bow can be helpful with shorter bows and increased forgiveness.
Some bowhunters prefer a longer bow. While a shorter bow is very nice to maneuver in cover, you will not know until you try one on a hunting shot. Experience shooting at game will give you insight into the criticalness of the set up and functionality as a hunting weapon.