I was talking about data that is *provided* ("provide incomplete information") so the account-holders can verify things, not whether that data is internally present.
The way the data is stored internally is irrelevant.
The information that is provided to you with or without a "final balance" attribute is the exact same. If an exchange adds a column giving you, for each transaction, the square root of the transacted amount it doesn't convey any additional information. The same information is just presented in a different way.
You want exchanges to save you the trouble of firing up Excel to get this final balance, not provide you with more information.
This is why your title is misleading.