David Gerard wrote
I remain utterly unconvinced of this alleged impossibility of reference.
OTOH - I thought I had a good argument by analogy with knowledge engineering. There it is common ground that so-called expert systems, that can justify arguments step-by-step from rules, do _not_ imitate real experts, but plodders without a real feel or mastery for a topic. That is, if you have a real expert, you distort the expertise by doing that to it.
Then I discovered that [[expert system]] is a POV piece of selling ...
Charles