It is a very nearsighted view of individuals and grossly oversimplifies people as intrinsically good or bad without considering how people change over time, or how they're ahead of their time and seen as right later.

Especially in the context of cultural production. We wouldn't have the Beatles ("more popular than Jesus" controversy, drugs, bed-in for peace) or probably any other rock/punk related music... also anti-racism, LGBT rights, feminism, and other social movements we look back on as positive would all have significant impediment to making progress if possible at all.

In a very narrow per-use-case context like rating a contractor on quality of work, or restaurants on quality it's obviously not a problem but the key difference is social-wide aggregation and enforcement of norms that sound good at the time (to a critical mass of people) but leave no room for society to evolve and improve through new ideas and beliefs.

Yes. We already have a silent score we give to people in our minds based on how much conformity is shared. It’s instinctually hardwired in to us.

Sure, and it is that generally harmful impulse that probably inspired the creation of this: https://www.youtube.com/watch?v=8rwsuXHA7RA