It won't go to the top of the pile itself, and if you insert new grain at the bottom of the pile, you have to elevate the existing pile anyway.
> It would turn into beer
I'm confused - are you suggesting reasons you should use a big hole in the ground or reasons you shouldn't use a big hole in the ground?
It won't go to the top of the pile itself, and if you insert new grain at the bottom of the pile, you have to elevate the existing pile anyway.