VSCO Film for Adobe Lightroom CC, 6, 5 & 4: Why are some of the toolkit items not stackable?

We use any and all adjustments needed to make our presets look right and to match the color, tone, contrast, and grain of the appropriate film types. However, VSCO Film does NOT effect White Balance, Exposure, anything in the Lens Correction panel, Noise Reduction, or the Local Adjustment Brushes/Graduated Filters.