This is the culture of having hundreds of millions of users. One user asking for something is just a data point and you have to rely on user research and surveys to know what users really want on average. But surveys have their blind spots as well.

The thing is, as a developer without having access to user research, all I know is what I want, and as a developer I assume I'm atypical. Whether it corresponds to what anyone else wants is questionable.

The opposite of this is people who assume that whatever they personally want is Obviously the Right Thing For All Users. You will find that attitude everywhere on the Internet. And that has its own flaws.