When I was at university everybody was in the mindset of "better publish 1 thing 20 times instead of invent 3 new things." This resulted in overly complicated and even fake-y writing in order to hide the fact that the exact same thing was already published 10 times.

Another problem is that people tend to write more complicated because the assume they sound more clever and intelligent when they do this and that their research looks more difficult.

That is one of the reasons I left science, nowadays it is mostly about the number of published papers, acquiring grant money and doing PR stuff. Actual science fell of the wagon 1 or 2 decades ago...