I also am willing to engage in a reasoned discussion of the matter. Clients and inventors typically are not concerned with whether you are revealing bits and parts of their invention or if you are providing an enabling disclosure.
Clients have expectations.
When we think our behavior deviates from their expectations it is prudent to get their consent. They believe that whatever they tell their attorney will be kept in complete secrecy. This is what they expect from their patent attorney. All of us have had clients require that we sign a Non-Disclosure Agreement even after we explain that as Patent Attorneys, the Professional Rules of Conduct prevent us from revealing their confidential information. They want the strongest assurances that we can give them that their brainchild will not be prematurely disclosed.