So the whole business should stop seeing crucial data that supports their daily decision-making, and wait for a data scientist to sanitise the data (however long it takes)?
The point was caution. Especially with market research and other non dollars and cents determinations.
Rogue data and artifact are not the same thing. Polling organizations (at least the good ones) have learned the pitfalls of categorization. The majority of potential customers may say they prefer prodcut B, but unless you know what A,C, and D were, or if other options were missing from the list (the old 'have you stopped beating your wife?' conumdrum), you don't know what they would actually buy. Even priming questions, that is seemingly unrelated questions asked before the choice have been proven to make a big difference in the answers givern.
Disastrous business and political decisions have been made by not understanding the data. When dealing with large amounts of data from disparate and uncontrolled sources, the risk is higher. By all means listen to those close to the issue, but remember that everyone, including those close to the issue can unintentionally bring in their own preferences and biases (remeber 'new Coke'?)
-- FORTRAN manual for Xerox Computers --