You handed in the receipts. The accountant lodged the return. The refund came through, or maybe it did not, and you assumed that was the right outcome.
Then a friend in a similar situation got a noticeably bigger refund. Then you noticed your novated lease was missing entirely. Then you remembered the rental property repairs nobody had asked about, and the work-related deductions a previous accountant had said ‘we will not bother with that one’ on.
Personal returns drift toward processing rather than preparation. Receipts in, numbers out. The questions that find the extra few thousand dollars only get asked when the person preparing the return is paying attention. Trinity treats personal returns as advisory work first, lodgement second.