I played in one campaign where I had to track arrows. It was a homebrewed world where anything outside of cities was extremely dangerous. We found eventually that the reason why was all the good gods had died, as this devouring entity had started eating them and then had gotten trapped, which let evil go unchecked.
It was a lot of fun, my character would have to go out and sneak around to find good wood for arrows and he spent his time during watches crafting more arrows.
Good then. The question isnt to count arrows or not, but to find how to have fun yourself with the arrows. There isnt a right answer. It depends on you as a player.
If you have fun, you are winning. Doesnt matter if you count or not.