Hi Michelle,
Not the definitive list, but here are a couple of ideas:
A fairly standard use-case is to use the SDM project to load a single set of raw data that you may need in different projects - each of which may require different types of transformations to meet the requirements of their individual projects.
Another idea is to check your raw data quality using the SDM's data quality reports. Comparing these data quality reports to those in the destination project (post transforms) can give you some insight into your raw data and how/where you can improve your data quality.
Thanks,
Jon Strauss