"Most people are actually pretty bad at explaining things in a clear, concise, helpful way, very often especially people well-versed in the field they are trying to explain. Communicating complex concepts to non-experts is indeed a fairly rare skill."
Except that we are not talking about numbers, we are talking about human behavior. Applying a formula to that, as you are attempting to do, is not going to give you the conclusions you expect.
FYI he's applying logical operations to sentences as logical propositions, which is valid and precise. Not hand wavey, and condescending like you are doing.
Looks like all three of us are being a bit condescending here.
Here is the actual logic: if people are not inherently bad at teaching, that means they are mostly effective at it, right? Were most of the teachers you've had in your life effective at teaching? Mine certainly were not.
Perhaps you were having problems with the use of my word "nothing" instead of "mostly," which is just a colloquialism. Idioms of language rarely respond to logic in the way numbers do.
Not just you're (derogatively named?) hackers but anyone who uses natural language for precise meaning; lawyers, mathematicians, philosophers. People who say what they mean, and mean what they say.
"Most people are actually pretty bad at explaining things in a clear, concise, helpful way, very often especially people well-versed in the field they are trying to explain. Communicating complex concepts to non-experts is indeed a fairly rare skill."
is not:
"nothing but highly effective teachers".