All software has known bugs or incomplete features, its the nature of the game - just like cars have known shortcomings that get fixed over time.
The copying / moving progress bar issue is that its an inconvenience (the pause whilst it calculates how many / big) caused by a convenience (the desire to show progress) not the feature (copying or moving). To use a car analogy its like your car deciding to display a countdown to stopping but delaying the application of your brakes whilst it works out what the steps on the countdown should be.
Albeit with less severe results perhaps
EDIT - To get round this XCOPY or ROBOCOPY are your friend...