When I ask (colleagues or other professionals) for critiques for design works/projects, I'm oftentimes not sure how to respond to it if I can't (honestly) say that I will implement the changes suggested by the critic. Often I can't do so (for several possible reasons, for example the project is already finished and changes are no longer possible), but I still find the feedback useful. Of course you could say there's no point in asking for feedback on finished work that I won't change anyway, but I still find it very helpful to get some criticism so I can learn from it for future projects.
But if I get some solid feedback, I'm at a loss at how to respond to it, since I want to get across that I did indeed find their input helpful, even though I won't be implementing any of it. If I just say exactly that and thank them (and maybe tell them why I can't change the design at this point), it feels dishonest.
How can I deal with such a situation? I'm not looking for a text that I can copy-and-paste, rather some advice on how to ask for or receive critiques and accept it without necessarily agreeing with/implementing all of it. Personally, I prefer to not argue about the criticism I receive at all (except if I didn't understand what they mean et c.), because there's nothing to be gained for either me or the person I'm asking. They told me their opinion, which I am grateful for, and it's up to me to agree or disagree with it, but they have no personal stakes in it so I don't have to 'defend' my design. However, not responding at all is of course suboptimal as well ...
EDIT: Since some people seem to have misunderstood, I do not mean asking clients for feedback. Rather asking collegues and other people with a professional background.