In much of the advocacy for "plain English" writing, the only real disagreement I have is the opposition to jargon.
I get the impression this is mostly coming from managers who dislike their own jargon & probably have good reason for it. In my & many other fields, given the right audience, jargon helps a heap with clarity & concision! Isn't that the point of Plain English?
Well, when writing hypertext I can link to definitions...
Don't know why this came back to my mind today.