He's doing it "his way". He doesnt care that he is wasting time and wasting material.
I tried to give advice to the kid once but was told it was wrong for not doing it my way. I could give a shit about the way he does it. I was just trying to save him some time and money.
I was curious why he didnt leave it the way it was and only cover the spots where he went to metal, or put filler in it. Because I know he didnt take all the clear off, so sanded clear will protect the panel just as if it werent sanded. After I sand a car it gets washed and may sit out side for some time. The only parts I prime are the repaired areas. But what do we know?