There is no reason for an arm drop start, other than to cheat the other racer. A flashlight start can be monitored with cameras, and is fair. A jump can be clearly seen.
Plus, chase-is-a-race is even worse. That makes no sense at all except as another way to cheat. As a racer at the starting line, what am i supposed to do, watch for the arm drop,then look over at the other car, and decide in an instant whether or not he jumped, then not move AT ALL, IF he did?
Nobody racing for real and for money, with a few brain cells and some street racing experience would race under those conditions, unless.....you were on the side doing the cheating.