Besides, they do so much computational magic on the stars that it's basically closer to what we're suggesting. They only count the stars directly, if they think the rating makes sense and is useful. https://www.wired.com/story/amazon-stars-ratings-calculated/
I don't care about what Amazon does with stars. I just want a 5 star rating for books. You guys can do whatever you want with the system for other stuff... But every book app I've used has a 5 star rating system that I tend to prefer for reasons stated below.