Duplicate questions that use different words to describe the same problem are important for people to find the content via search engines. But I doubt that search engines add redirecting pages to their index. So such duplicate questions are not searchable. Anonymous users can't even reach them.
OK, pages with duplicate questions can be served to Web crawlers without redirects. I could imagine this being problematic with search engines, as we would be displaying different content than what the search engines see. It is called cloaking and violates Google's terms.
I vote against this anti-feature.