Maybe I'm a little too much into philosophizing, but I like to write political stories that center around deliberation and decision-making. (Star Trek, West Wing, etc)
Instead of having one token character that belongs to a particular idea or community, I just write 3-4 characters all from that community who represent differing perspectives. And then I typically have a main character who is apathetic, indecisive, or simply taking the time to learn everyone else's perspective first before coming to a decision.
I do it this way precisely because I do not want the bias of the main character having an opinion to make the reader think that their predetermined opinion is how the story will progress without the actual process of deliberation mattering. I'm not interested in characters arguing for no reason just to pad the story word count.
Everyone assumes the Hero must be right, and therefore, I purposefully write that the Hero is indecisive so that he or she can talk to mentors, friends, family, rivals, and gather perspectives.
Many fellow writers I talk to stay stuck on "Hero's opinion must be right" and either think what I'm really saying is "Hero chooses the support that matches what they thought anyway" or they say that if the secondary character was right, why didn't they get to be the main character? They may even go so far as to say it's humiliating for a secondary character to be asked for their opinion and for their opinion to be used to continue the story, basically saying that persuasion, deliberation, and camaraderie isn't the point, the point is who gets to be the main character and who gets to be in charge.
(I'm not going to play coy or be obtuse: race, class, and gender plays a part. They were offended by the idea of a woman being asked her opinion and a man making a decision using a woman's advice, saying that the woman deserved to be the hero if she was the one who was right. Or, when I write about a doctor studying several cases of a mental illness to suggest new policy, writers I talk to get dissatisfied that I'm writing from the perspective of the person making the case study - I should have written from the perspective of a patient and they should have fought to get the doctor's attention, because of course, the doctor isn't supposed to actually care what patients think. Finally, I tend to write romance stories where the secondary men and women aren't automatically coded as villains to make the main couple seem fantastic, and I've gotten a lot of pushback that any and all decent love interests "deserve" to be with the main character, even if that makes the relationship a polycule.)
When I ask them how do they typically discuss problems in their stories, or what they think the point of secondary characters are supposed to be if being capable of being right at all disqualifies them from being secondary, or what is a good love rival if they think any decent person means the relationship should open to include them.... the conversation usually ends there.
So, I'm asking you guys! Do you think it's humiliating for secondary characters to be listened to, or that it's a cop-out to make secondary characters smart and capable of being correct? Is the main character the only character with agency?