I've recently asked my first question: Should players know each others' secret backstories? It was put on hold as being primarily opinion based. I do understand that there might be no absolute answer to this. Still, I'm hoping for expert opinion that is helpful in forming a decision in such a question.
What information (about my players, about my world, the campaign, our agreed-upon meta rules, etc.) do I have to add to the question in order to make it less opinion-based?