I completely agree, but it sure does help to listen to everybody. I always joke that I am a complaint sponge that just absorbs every little nit pick and bother anyone has with a product. Listening is the cheapest and easiest thing I can do to make someone feel better about whatever it is I end up having to do. An overwhelming amount of the time I am unable to fulfill a request because the backlog is filled to the gills with other requests. Listening to people, asking clarifying questions, and digging into their issue and how they feel about it almost always makes them feel better. Don't retread ground that has already been covered, but I have a much better time telling them their idea may not be implemented for a long time after taking thoughtful time with them to make them feel heard. I also try to disappoint upfront. No use telling them the idea is in the backlog if they have heard that 1000 times only to have the ticket sit there for years.

At worst you learn a little more what someone thinks while getting them to talk and complain, an act most people find comfort it. At best you get incredibly useful empathy on a nagging issue that can benefit others. So yes, people usually have no idea what they want, but good luck telling people that. It's the PMs job to get everybody on board for the vision of a thing and how it addresses the problems behind the problems otherwise a perfect implementation of something a customer did not feel heard on will land quite different that something that they did. My two cents for what it is worth.