You make fewer last-minute decisions
Before, you only decided to restock or fix something after the product had already run out or the customer had already complained. With a real weekly check-in, you start deciding what to restock, move, or fix before it turns into a problem. The result is fewer rush purchases and less stock sitting unsold for weeks without anyone noticing.
You get a monthly close that shows the real result
Without a monthly close, you work off a rough idea of how much you kept that month. By closing income, expenses, and costs, and reviewing how products and new purchases behaved, you start each new period with a real number instead of a guess. That changes the kind of decision you can make the following month.
You turn reviews into decisions instead of loose numbers
Before, you often ended reviews with "I looked at the numbers" and no real action. By requiring each close to produce a decision, keep, fix, or stop, you cut down how often the same problem comes back with no answer. Less repetition means less time spent reviewing the same thing month after month.
You keep the weekly review quick instead of a monthly close
When your weekly check-in absorbs the work of a full close, you lose time that should be spent running the store. By separating what each period answers, your weekly check-in goes back to being short. You get that time back during the week and keep the monthly close as the right moment for the full result.