I have seen a lot said about tracking ammunition.
We just say 50% recovered. Was that combat 4 rounds? Ok. I mark off half of the arrows I shot.
If I miscount rounds of fire (shrug) close enough. The missing one subtraction is just random error.
I am not saying people should not have other means to track this but will never understand how keeping a rough count is hard to do. Especially when folks saying it is are asking for more complicated combat options.
The only explanation I have heard is “it’s not fun” to mark off arrows

follow your bliss but please don’t tell me making a hash mark on a sheet is hard work