If you read the link, you will see that it makes a point similar to what you are saying (but more nuanced, and well thought-out than an HN comment). No one is arguing that perfection is achievable (or even a goal), the question is what form of feedback is most effective in providing desirable outcomes.
Every government executive's job (including appointees' jobs and to a degree every program), relies on a public vote every 2-6 years.
Democracy isn't nearly perfect, but as we've seen, neither are the markets.