Once the buyer has paid good money, if they misread the item description it's their problem. The seller does not need to do anything but ship what they described. Yes, the buyer can be an ass about it and complain and demand their money back and threaten negative feedback. They can do that any time, but all the buyer can truly do is leave negative feedback at that point, there is not much else. What you seem to be suggesting is the reason to not give feedback for prompt payment is to reserve the right to exact revenge on a buyer who leaves negative feedback.

That doesn't sound like a very good way to do business to me.