Why uniformity is a potency question
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A scoop can be the right weight and still be the wrong dose, if what is in that weight is not what the label says. That is the second half of the dosing problem and it is the half that is invisible.
Two ways to get a dose wrong
The quantity can be wrong, which is the scoop problem. Or the composition can be wrong, which is the blend problem: the right mass containing the wrong proportions.
The second is worse, because it cannot be seen, cannot be felt, and does not announce itself. A customer scooping accurately from a badly blended tub is receiving a random sample of your formula.
What uniformity means here
That every serving contains the same ingredient profile at the same concentrations, wherever in the batch and wherever in the tub it came from.
Where a blend is not uniform, sports nutrition powders come out with inconsistent flavor and multivitamin powders with varying nutritional content per scoop, which directly changes what the label claim means.
So uniformity is not a quality nicety in this category. It is whether the number on the panel is true.
Why supplements are harder than most blends
Because the components are deliberately unlike each other. A protein powder blend might contain a bulk protein at eighty percent, a flavor system at a few percent, a sweetener at a fraction of a percent, and a vitamin premix at less than that.
Spreading a gram of something evenly through a kilogram of something else is a genuine engineering problem, and components differing in size, density, shape or surface properties will separate again once they are allowed to move relative to each other.
That is also why proper blending helps potency in a second way: dispersing a sensitive ingredient evenly with a protective carrier is part of what keeps it stable over shelf life.
Proving it
Sample from multiple points in the finished batch and compare, rather than taking one sample from the top. The variation between those samples is your uniformity.
For anything where potency matters, that means assay rather than appearance, and it means doing it on the first batch of every formula rather than once when you started.