Academic writing suffers, albeit to a lesser degree, from the same problem that has made legalese so annoying to read: the need for specificity.
Also, a need for references. Not just citations, but verbal references. What is jargon, after all, if not a specific and functional set of keywords and referents used in common by a given group or field? Jargon is efficient in academia. It is a common standard. If I write something in my field's jargon, people in that field will know what I'm talking about, and precisely what I'm talking about. This is more efficient, sadly, than trying to turn a clever phrase to describe a phenomenon there's already a perfectly dreadful word for.
Also, a need for references. Not just citations, but verbal references. What is jargon, after all, if not a specific and functional set of keywords and referents used in common by a given group or field? Jargon is efficient in academia. It is a common standard. If I write something in my field's jargon, people in that field will know what I'm talking about, and precisely what I'm talking about. This is more efficient, sadly, than trying to turn a clever phrase to describe a phenomenon there's already a perfectly dreadful word for.