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.
You could say that about any story that fills in a gap. It's just part of the job. We all have our own ideas about various events, but only one gets picked. I had my own idea of how the Eugenics Wars would've gone, but Greg Cox got to do his. But I got to be the one to tell Picard's missing years and how the TNG crew first came together. And Mangels & Martin got to explain how the Klingons got their grooves back. And so on.