I think that you read my comment in a way that I didn't intend. "How well" would probably be better phrased as "whether", because "how well" implies a non-binary state.
I was picturing a requirements list of numerical ranges, which a specific unit of a product must satisfy. "How well" is what came to mind when I pictured a unit that nearly exceeded the limits of its requirements, compared to a unit that sat perfectly in the middle of the range of every requirement.
I never pictured any kind of "judgement call", and I'd hoped that would be clear, in the context that I'd set, talking about objective measurements of quality.
How “well” something fits is absolutely subjective. It’s a judgement call with no objective measure.