The thought process we go through to work out "what circumstances your design is good for" highlights problems. (e.g. "David, your navigation really well when there is a predictable number of categories, unlikely to change") highlights the shortcomings implicitly (e.g. "But, we're designing a wiki here, anyone can add anything.")

It sounds like you're a mature designer capable of taking criticism without any issue whatsoever. Most designers aren't like that, and unfortunately many who are can be difficult to work with because they think everyone handles criticism as "well" as they do.