Better not to ask feedback, if you don't respect it.
It is the feedback which managers' ask the team. Feedback about work, people, environment and organization. Getting feedback from people generally motivates, as it makes people feel better that they are being heard.
Though it is mandatory for the managers to get feedback, at times it would frustrates people more than they are already frustrated. At the time when they find their feedback was not respected. Respect come from addressing the feedback, amending the value it brings, or atleast reasoning why the feedback was not considered. But ignoring the feedback as if it was never heard, disrespect the feedback and also the person.
So, if the intention to ask feedback is to just motivate the people and not really addressing it; it is better not to ask feedback.