"Probably the reason people expect feedback about why they were rejected is that they implicitly think of this as like a grade in a class. But a test where only a fixed number of applicants can pass regardless of the average quality is not a grade in that sense."
Actually, I disagree with the premise of this statement. I don't want feedback on why I was rejected, I want feedback on my product. Yes, I can see that it is very nuanced and difficult for you to say which idea/product is better than another, and you have your own business reasons for making those decisions. I don't think anyone really expects you to disclose those reasons, and even if you did it would be completely subjective and would just lead to arguments. However, given that, you're only addressing why you don't comment on the relative strengths of the applications and not why you don't give feedback on any individual product/idea.
Actually, I disagree with the premise of this statement. I don't want feedback on why I was rejected, I want feedback on my product. Yes, I can see that it is very nuanced and difficult for you to say which idea/product is better than another, and you have your own business reasons for making those decisions. I don't think anyone really expects you to disclose those reasons, and even if you did it would be completely subjective and would just lead to arguments. However, given that, you're only addressing why you don't comment on the relative strengths of the applications and not why you don't give feedback on any individual product/idea.