So what you're saying that subjective notions of "feel" are important to the idea of product quality, but whether the product is actually well engineered is jus

So what you're saying that subjective notions of "feel" are important to the idea of product quality, but whether the product is actually well engineered is just "loosely correlated"? Wow. You are twisting yourself into a pretzel to emphasise that which favours your opinion and disregard that which runs counter to it.