As far as "be a sheep"; most people are doing this already to some extent. They draw their opinions from a combination of media they watch and friends and social groups they identify with. Directly evaluating a policy can be very difficult, so they instead rely on a network of trusted opinions.

Letting people do it totally passively, however, could be bad. We know that people lean heavily towards default behavior when possible. So if the person you mirror starts deviating substantially from what you expect of them, you will be unlikely to change your preferences in a timely manner.

There's a whole host of other problems with such a system that make its marginal advantages seem not worthwhile.

Capitalism vs socialism debates generally happen without acknowledging that the vast majority of the world uses a relatively narrow spectrum of hybrid systems. Some free markets, some social safety nets and regulations.

Pure socialism and pure free markets have rarely existed at any sort of scale or for any substantial length of time.