Necessity and functionality are not synonymous terms. Just because you set your bag down doesn't mean you don't also keep the bag on. If a tee is backed up or there's a long walk between holes, then the bag stays on my back for stretches. Also, I'm assuming you don't set your bag down when you walk to every other player's lie. If you out-drive the group, you've got 3 other players to wait for to take their second shot.
And I'm sure your Sesame Street skills of counting are so revered locally that they stopped requiring you to use score cards in tournaments. But for most of us, we still use cards or phone apps or birdie beads during casual rounds because it's one less thing to worry about and we can just play. But you keep counting on your fingers every other tee to make sure you didn't lose your place; I won't hold it against you. :hfive: