I believe there are two questions in this topic:
1. Why Andrew shouldn't trade after he reaches his daily goal
2. Why you shouldn't or should (and a lot)
1) IMHO Andrew has taken a bigger role than to be a successful trader all day long. I wouldn't be here if not for his books, chat room, videos and this forum and it takes time!
2) I compare Andrew's style to a 5K run, it's fast its at high intensity whereas trading mid day is a half-marathon and requires different training style and lots of practice if you want to be good. If you're here from 9am to 11am and not looking at price movement all day then you're training for 5K.
My limiting factor is time, I only have few hours a day therefore I can only hope to get good at maximizing my performance with ORBs, Engulfing and occasional ABCD and forget about reversals and MA trading.
if you're in SIM trade as much as time and energy allows, you will get better! Good luck!