> Conversely, when such feedback and communication is overlooked or ignored, over and over, engineers often stop giving it even when they are interested.

This is true but I find if I can explain why the feedback was overlooked, that can help diminish the negative feeling. It hasn't happened often in my experience but sometimes when it has, if the idea is feasible and won't detract too much from the critical path, I would push the business team a bit harder to allow it so as to avoid the constant ignoring feeling that can happen.