Yes, and no.
Hard to understand why
MASTER RESOURCE has Text / Comments / Media
SOURCE DETAILS has Text / Comments / Media
Are these not essentially the same ?
In some sources, the master source includes much if not all the data, and the media item (or text to comments) can be added to the master source. An example of this is an interview with a family member that, while referencing many individuals, is only one source video or audio file. An individual copy of a will could also fit into this category. However, a database of images of wills would fit into the next category.
In other cases, the Master Source is a generic reference to the source, and the specific details are included in the Source Details section. Example of this are B, M, D registrations or census records, where the master source directs you to the right place, but the Source details take you to the correct film and frame or book and page.
An example of where you might consider using both is with a family bible which has several pages that include information. You could attach images of the cover and title page to the master source, and images of specific pages to Source Details. Alternately, one could also attach all the pages to the master source and only make references to the details in the text.
RM provides flexibility to let users use the program how it best suits their needs and the way they want to work and use the program.