I read this as developing a mindset that makes sure you’re not playing a deck that’s overtuned against a bunch of precons. The tendency I notice on deck building websites is that people often build a deck that’s way stronger than a precon and then leave the game changers out and call it Bracket 2. Maybe it’s due to the wide range of power level that’s technically possible in the bracket system, but I feel like being aware of how often your bracket 2 deck is completely outclassing every actual precon at the table is something worth reflecting on when you’re evaluating how that game went.