Jamie H I agree with your thoughts as well. Because the humans buy the food, companies market to them. They will try to make foods that follow their fads. If you notice dogs don’t fall for fads. It’s not them putting stupid dresses on themselves or trying the latest diet (not per their request anyway) or watching TV and asking for what they see in commercials.
Unless your animal has a medical reason for needing supplements, all of their nutritional needs should be met with the food they eat. Just like people.
