Because the use of asbestos in the pads is illegal,the discs are made of a softer material to give the same feel-discs are usually no more expensive(sometimes cheaper)than the pads and are as quick(or quicker) to change.Not just KA-all vehicles.

Not correct. Since the banning of asbestos pads have contained more metal particles to give good friction properties and because of this they are generally more abrasive and wear the discs quicker.

But disks are not expensive, the last set I bought cost the the same as the pads.