Hey - that's what I said! (Except for the country doctor part.

The "solar plexus' is virtually impossible to access through human produced "blunt force trauma" absent falling from height and striking an object, or a similarly induced situation in rapid deceleration in an auto accident.
Thanks Doc
PS:
I agree about the posture affecting breathing. Certain strikes or combinations thereof have the affect of "sealing the breath," as it is called from the old Chinese - and there are specific postures, movement, and breath exercises that will restore or "unseal the breath" in an instant. My students are conditioned to perform the function themselves when they are struck to that degree during class. In fact one of my browns had the occasion to use it last night. (I told him not to be bring a girlfriend to watch class. Fortunately she left before it happened.)
Colloquilisms are fine unless you're teaching on a level that requires deeper understanding. On the other side of the coin, students have become accustomed to "understanding" everything as they learn, and that is a bad idea. Information should be disseminated on an "as needed" basis, leaving students free to concentrate on "how" to perform their physical movements correctly. Concentrating on "how" to make self-defense actually work is a much higher priority for students than understanding "why" what they do works.
Reality suggests as students progress, more and more information will become generally available. Instructors will have more of this information however even they have limited information of "why," as they struggle and concentrate on becoming teachers of "how" to teach execution. True senior professors know the "whys" while many with lottsa stripes know only "how" to put stripes on belts better than anything.
"General knowledge always produces general results." - Ed Parker Sr.