Just because it’s a problem you’ve never encountered doesn’t make it stupid.

You’ve clearly never had to deal with a lot of references. Author lists can cluster. If you’re reading, it can get tedious if the last 5+ references are to the same three authors. Let alone 20+ references.

This happens. In some writing it happens _a lot_.

It’s a common enough that it’s even explicitly mentioned in the Chicago Manual [0], one of the main style guides for academic writing in the US:

> Em dashes also substitute for something missing. For example, in a bibliographic list, rather than repeating the same author over and over again, three consecutive em dashes (also known as a 3-em dash) stand in for the author’s name.

[0]: https://www.chicagomanualofstyle.org/qanda/data/faq/topics/H...

Hmm, like in the References section for a paper? Personally I don’t see any point to typing that sort of thing out (bibtex handles it more accurately that I could anyway).

For the reader… I dunno, do people actually read through a citation list, in a manner where the redundancy would be relevant? When I look, I’m usually specifically looking for the single entry that corresponds to the citation on some claim in the text.

Although if someone really wanted these triple-dashes for their journal for some reason, I bet some tex could be coded up that would generate them. Could look neat, maybe.