Originally Posted by
I-Like-To-Bike
Exactly correct.
Generally speaking, though, paving contracts should specify this sort of thing. The reason milling is typically done is so that the new pavement doesn't get higher than storm drains and other drainage facilities. It often has nothing to do with ensuring that manholes (be they for telephone, water/sewer, etc) are level with the pavement.
At least in my neck of the woods, they always mill, but in many other areas I've seen, sometimes they do, sometimes they don't.