So, you fire-up the air polisher again. Within four to five minutes, the scratch is gone, but in its place is a shallow bowl and a vaguely grayish area where the scratch was. It looks okay (you suppose) but you wouldn't be happy if this piece was installed in your house. You rub a little wax on it, all while hoping that your customer doesn't have a kitchen bay window, under-cabinet lighting, or a discerning eye.
Another scenario: you take delivery of several special order exotic slabs needed to fabricate a large kitchen. The turnaround time on the slab order was four weeks, and the kitchen installation was scheduled for two weeks. Due to some shifting during shipping, you are horrified to find that half the slabs have been damaged with mild scratches running the entire width of the slabs. So, you send the slabs back and reach for the phone to call your customer. You tell her that it will take four weeks to get the new slabs delivered, plus an additional three days to fabricate. So, she should get the kitchen in a little over a month. You hang up, hoping that her next call isn't to her bridge club, telling them all about your company's inability to deliver on time.