Shortcuts for evaluating these disagreements ("distrust any expert whose employer has a stake in a technical question") are crude and often lead you astray. If you dismiss any expert employed by a firm that wants to bring a new product to market, you will lose out on the expertise of people who are so legitimately excited about the potential improvements of an idea that they quit their jobs and go to work for whomever has the best chance of realizing a product based on it.
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