Im sorry but I disagree with that completely. Personally I will purposefully not be using the max contracts allowed.
Sure, you don't have to. But more contracts you use, less wiggle room you have for a stop loss. Less contract you use, more time/trades it takes to reach the profit target. So it is a balancing act. It is alright to go big when the gods make the alignment perfect for a particular trade.
Each day will start on 2 contracts and build up depending on the equity built up through the day.