I see why you think it's pointless now. I think a lot of times, people ignore others instead of giving them feedback because they're concerned that it will be rude to state their problem or because they assume the other person will be stubborn. I am much more likely to ignore a stubborn person and much more likely to give feedback instead if I know a person is open to it.

For me, that's a major factor, so I figure there must be people like me.