Insufficient description / value information within the Audit Reports

Hi,

Since not all fields are logged within the Business Object Type (f.ex. Person Address, Person Legislative Information, …), it seems impossible to correct something that has been wrongly updated and vice versa. Is this statement correct?
So it is possible to detect who did the update (or creation or deletion) and when (unless the user did a password reset?) but the previous data details and new data details can not be retrieved (f.ex. street number has been changed from '1' to '11')? Why is this? This seems to be the purpose of the Audit reports in the first place; To be able to check which information was applicable before and to what it has been changed from a certain moment in time.