because the recipe is being varied to maintain consistency, which is more of an adjustment than a variation
I'm not sure I'm following this. I thought the idea was about consistency or if that was that even possible. Blending, adding castings and altering the formula are all ways tobacco companies try to achieve an acceptable level of consistency. One could say crop variations result in adjustments (of one kind or another) to achieve consistency. The two are indeed intertwined. Nature is inconsistent, adjustment allows the blender to achieve consistency in spite of what nature produced. I see one as the logical consequence of the other.