Speaking as a "newer" member of the ICC, I have some points to make on these issues. I should also state that the views I state below are my personal ones, rather than any considered statement of the ICC! But as other ICC members are already expressing disagreement on this thread, perhaps this already obvious!
Our failures (and there are many) in expressing our ideas are, in my opinion largely due to our isolation. I wasn't in the ICC at the time, but during the 90s the organisation turned in on itself to some extent due to the pressure of the times. This led to a tendency for our language to become more wooden because we were mainly debating with ourselves (or occasionally) with the CWO. This has generated a lot of bad habits where we unconsciously assume that our readers will know what we mean by certain terms, simply because that's how we debate amongst ourselves. With no or little criticism from contacts, it's been difficult to know how to change.