> a single sentence may be unpacked on multiple levels because the reader/audience for the paper is someone who has a deep background in the subject.
This supposed information density is often a pretext for obfuscation, though. The author is essentially hostile to the reader, fighting a vicious obfuscatory rear-guard action against their comprehension of anything beyond the conclusion they're meant to cite or the technique they're meant to implement (and cite).
I often wonder whether I found student theses so much more helpful because they're long-form, or because either idealism or a less-developed sense of the threshold of acceptable bullshit they can get away with leads them to present their claims and process more clearly.
on edit: better structure
It seems like a military thing. Though I know other people that do it whenever they're trying to summarize anything tersely (and think they're succeeding when they failing terribly).