CDcopy utilities required?

[vystand]

Kinda curious;
What's the need for progs like clonecCD? (well, for audio i can see the need, i think)
How come you can't just copy ALL files off the CD and then burn them identically to a blank? I've had to do it a couple times (sometimes cloneCD couldn't read alot of sectors(or was it blocks?) so i had to abort) and it worked fine...

Is there a more technical reason?
I copied the first disc of battlefield like that and the installation ran fine (as opposed to it failing using a clonecd made copy, but i didn't finish the install or try the game with it so...)

P.S. keep in mind I don't hate cloneCD or anything