explain how the use of subsidiary records improves the presentation of financial reports of a business.
I would of thought more along the lines of that it upholds the qualitative characteristic understandability by listing specific transactions related to each debtor and creditor of the business so that the information presented is understandable and comprehendable to non-accountants so that accurate decisions can be made for the reporting period.
Thats incorrect! (A common mistake, of misinterpretation.)
As accountants we assume users of the accounting reports do not have a strong accounting background. Thats why we classify, etc. However, the T-Accounts and other things like General Ledger etc, are not provided to the user (customer).
Only the P/L statement, Bal Sheet, CFlow are provided to the customer (user). Hence, we classify these three reports, so thats its easier to understand. We dont actually classify the subsidiary..because, the user does not read it. Hence, the Qualitative characteristic of Understandibilty does NOT apply adequately to Subsidiary Ledgers unfortunately.