If there was only one thing I could change it would be this: If someone marks a question as duplicate, and closes, make them provide a link to the 'original' question and a brief summary as to why it is a duplicate.
Closing something as duplicate and then forcing the user who submitted the question to do more digging comes off as hostile, lazy, and even condescending. Sometimes the original question is lazy and un-researched, but in most cases it is hard to find the right search term for the problem you have.