Weird Bookkeeping question...Watch
The financial statements will also present a clearer picture that you can't see from a bank statement alone e.g. the financial performance of a company (income statement), and the financial position of the company (balance sheet). You cannot see what assets and liabilities you have just by looking at what items there are in the bank statement. Debtor and creditor accounts may contain balances that you can't see in a bank statement.
On a bank statement, you can mistake equity/loans injected into the company as revenues, and asset purchases as expenses. VAT won't also be properly accounted for, as it comes out every quarter/month, and it's not correct to account for VAT as part of operating expenses.
If the business is simple, does not charge VAT, based solely on cash accounting, requires no start up capital, has virtually no assets or liabilities, you may get away with saying that what you see in your bank statements is what the financial statements will be, but it's unlikely.