[lukan]

"If you want to store stuff, you would put these pits along the bottom of the hill, not running a long distance up the hill."

Unless you want more favorable conditions for long term storing, or in case a enemy comes and blunders what is easily avaiable at the bottom of the hill.

[pseudohadamard]

If you're hiding food from enemies then you're going to pack it into isolated hiding places, not jammed together with 5,000 others in a feature visible for miles around and where everyone that the enemy might decide to question knows where it is. So storage, yes, but hiding it from enemies seems unlikely.