I have used a saw in the past (and I've used hatchets and axes too) but I never NEEDED to.That's interesting, do you use a saw?
In my youth I have chopped up trees and sawed down trees for firewood, but now that I'm a little older (and hopefully wiser), I have come to realize that it is very very VERY rare to not be able to find plenty of firewood already on the ground...you might have to walk a little farther, and look a little harder, but it's there.
Plus I try to leave the wilderness as untouched as possible so the next camper can enjoy it.
I hate to see some guy chopping down a young perfectly healthy tree for firewood when there's plenty of fallen trees already on the ground.

In fact, if I go camping with inexperienced younger guys, or less experienced older guys, I hate to see them bring along an ax or hatchet...
Sooner or later, they're gonna use it whether they need to or not.
There's just something about having an ax in the hand that makes a man want to chop down a tree.
I don't know why but I've seen it too many times.
It's like carrying a firearm in the wilderness...sooner or later most guys want to shoot something whether they need to or not.