Depending on the nature of the hierarchy, they can engage in dishonest one-sided discussion because if you agree with them, good, if you disagree with them, they can just say something like 'I hear your feedback and will keep it in mind but we are going to go ahead with the original plan' and then pull rank.

This is, however, only as bad as your lack of leverage as a subordinate. If your dissatisfaction can make your superiors' lives harder (by quitting or by working suboptimally), you'll find that they become quite a bit more reasonable.

Hierarchy overrides reason.