I have hunted some in open fields and some in the woods.
I always try to use some sort of rest. knee, tree limb, I have used crossed sticks in ground blinds.Most of my shots recently are around 100 yards. Very seldom do I get a shot at a buck that is not moving. Most does are standing still.
I have shot several bucks running hard after does. Bucks that stand around in the open where I live have a short life expectancy and are usually young.
When I see a deer I want to shoot. I don't wait long to shoot I learned young hunting in the woods that the older ones have a knack for getting behind a tree or just taking off if you wait. I don't expect or wait for a buck to stand still broadside.