Routine is a killer, it only allows you to do your safety with the least amount of hassle and the shortest time. You mistake the speed in which you carried out the task as an indication of proficiency.
If you know a system is mixed up, you take care, you double check, you never assume. All AC computers should obey one simple law, sequence of data can never be assumed, and we will all be a lot safer.
Games you say ? Well if you want to land AC without even knowing you did so, then way to go, but otherwise forget it.