Do it right the first time!
Do I have to diamond grind? Why do I have to grind? What type of grinder? Why can't I coat without preparing? Is it dusty? My floor is new why can't I skip the prep?
Risk Mitigation is the reason you want to Diamond Grind your concrete shop or garage floor. It helps to eliminate the risk of your floor coatings (epoxy, urethane, Polyurea or Polyaspartic)from peeling. Hot tires don't peel coatings. Poor prep does!
There are other methods of preparation. Some better and most are worse. Don't skip the prep. Do it right and keep your coatings tight.