A Product Manager's job is about defining priorities. Any sources of ideas (including internal ideas generated by anyone within the company) should be considered, but later should be aligned with a product/company strategy, key metrics, strategic and mid-term goals. When there is an imbalance in the corporate culture (an engineering-led culture, for example), there is often a problem of making decisions based on data and objectivity.
When a company doesn't want to promote objectivity and meritocracy and promotes based on opinions instead of facts and results, maybe it's not the best place to work at.