I've always thought that one of the great aspects of the the Harry Potter series is that JKR does not seet the need to include every detail. This can make other stories seem overly long & tiresome. Yet, many people seem to be complaining that the one detail they thought should be included wasn't there. Knowing that, she can't please everyone -- she kept it short & sweet.
Here's a chance to add what could have been added to the ending.
My $0.02 -- I would have liked to see the owls fluttering around the country & wizards galavanting in their robes with reckless abandon in celebration of the defeat of voldemort. Finally one owl would make its way to where the Dursleys were hiding & Vernon would receive it happily as they would finally be free of their imprisonment. It seems to me that stories out to end with some sort of parallel to their beginning.