In some fields of research, huge collaborations are the norm. This is especially true in experimental high-energy physics.
Say I'm evaluating someone's resume, and that person is transitioning out of one of these fields into something else, such as a career in industry or teaching. I'm not a specialist in that field, and I'm not familiar with current research in it except at a very broad level. How do I tell whether this person was any good at what they did? I can do a literature search on the person's name, but that will just pop up a bunch of papers where the list of authors looks like this: "The XYZ Collaboration: A. Aarons, J. Abelson, ... [183 additional authors not shown]"