@Gary - it's a question more for Kovid than for me. Most of my work around duplicates has been what I can do from a plugin without touching the Calibre source code myself.
As for why it is the way it is - only Kovid can say for sure but I suspect it is just the case that his dev time is spent on other priorities, and if someone were to submit a patch to improve it then he would consider it. Other than make suggestions (like enhancements to automerge which Starson17 did) I've not attempted to change that part of the codebase myself. As I said above I have some disagreement with a number of aspects of the behaviour, which means the scope of the changes I would make to it might involve more debate that I haven't the time to get into. However I can't see that displaying the authors for the titles it is saying are duplicates as being too controversial (just that it might involve changing a number of bits of code to enable that).
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