The best intuition pump I have for product managers is the analogy of hedge fund managers. There exist people who can predict the market, just like there exist people who can predict how a product or feature is received by the market. Most people claiming to can't. The people who can are expensive. You can't reliably train white collar workers to be hedge fund managers, and you can't reliably train white collar workers to lead product development.
That mostly encapsulates all of the "but this guy at Apple" objections that get thrown around by people defending product orgs, as if they were a business insight that most of us don't yet understand.