@Chris324, I know this was from a while ago, but I think the main reason they are adamant about the 14-day rule is because AirBnB's highest priority in this area is prevent either the guest or the host from seeing what the other party wrote before they write their review.
The problem is that if they allow "exceptions" to the 14-day rule, when would they publish reviews only written by one side? If they publish one-sided reviews any time before they close the window to reviews, then you open the door to reviews written strictly in retaliation.
Given that reasoning, though, the count of 14 days is arbitrary. As long as AirBnB doesn't publish either review until both sides have written one OR at the moment the review window closes, then the system works.
I imagine the 14 days was chosen as a balance between those who wanted one-sided reviews published faster, and those who (like yourself) want to give the guests more time to write a review. It would have been interesting to be present when they debated what number of days to choose.
Your request is reasonable, but I assume you are not advocating for the ability to write a review once the other side has had their review published, correct?