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Quality parameters should be quantified for consistency and continuous improvement.
Companies selling consumer products track a set of quality parameters important for their consumer experience. These parameters are also used to compare their offering against their competitors.
My experience in working with these companies indicates that some of these quality parameters have subjective measurements, such as colour, texture, softness, smoothness. As a result, the same product may be rated differently by different employees.
Many companies have, however, managed to quantify these parameters to eliminate the rater bias. In my opinion, it is a necessary step to ensure consistency and to institutionalize the process of ongoing improvement.
Unless we quantify the measurement, improvement journey is difficult to pursue.