I'm skeptical that the only way for them to be precise and technical is to make them impenetrable. I think there is a culture of academic writing (many different cultures, really) that has adopted a voice and writing style which became a parody of itself over time.
Here's a trivial example: You frequently see papers use the passive voice, something a middle school English teacher would mark with a red pen. 500 participants were asked, vs. we asked 500 participants. In what sense is the former more precise and technical? It's not. It does not convey any additional meaning. People use it to sound objective and distant, even when they really aren't.
Realistically, academic writers usually don't even think about it as much as that. They're just copying the tone of other papers, because there is a culture and it enforces certain behaviors on its members irrespective of the value.