I think it's better that the story not be told. Not every gap needs to be filled. There's always room for mystery, especially for characters who are so unique.
I respectfully, greatly disagree. Any story that can be told well should be.
Unfortunately, there is no guarantee that just because the story can be told well, that it actually will be. It would be a shame for a much-anticipated backstory to wind up being a disappointment.
Further, whether it is told well or not, is it fair to all the authors to allow one person to determine the background? Each would likely have their own story in mind, and some may well be equally good, if not better.
Kim: I'm detecting some weird technobabble.
Janeway: A possibly dangerous anomaly that we know nothing about?
Kim: Yeah. I suppose we should steer clear.
Janeway: Ha! Good one, Ensign. Take us in, Mr. Paris.