Oh, ok. I was mostly talking about how an individual can get maximum benefit from feedback. One of the biggest sources of growth for me has been actively engaging and acting on the feedback I receive. For more on that, I strongly recommend Thanks for the Feedback by Sheila Heen.
You're right that it's hard to get others to learn from feedback if they don't actively work at it. You can make your feedback easier to understand and more action-oriented. But if they're lazy or even just focused differently, your feedback to them won't be very effective.
As a manager, I think it's still worthwhile to give as much feedback as I can. Some of it might be heard and acted on, which will help the receiver grow.