While I personally have no opinions on FFXVI, I find that such a consumeristic stance, that the only valid way to form an opinion is by (buying and) playing/watching/using it themselves. Because if so, how can anyone be meaningfully opposed to a product or a piece of media? Seems a little strange if even people who are critical of something are supposed to buy it.

Sure they may have no firsthand impressions, but they might make their minds from a variety of reviews, critiques and discussions around it.