In building a Report from a workflow, you are restricted to that one style of report.
It can be useful to build a Report in a certain way for one customer, and in a different style for a different customer. For example, there may need to be greater emphasis on one area of data for one customer, and another customer is more interested in a different area of data.
Therefore it would be useful to be able to create multiple reports. Whether thats multiple Master Pages, or Multiple Layout pages I dont mind. At the moment I am having to create a Report for both customers and then delete one half of the content, depending on which customer to send it to. It works but its not elegant.