Firstly, please do not tell me to chill out.
This is not personal. You asked for an opinion, I gave it.
A typo is a sign that this was not proofread. If you actually read the part about the hair being hydrated you will see it is as I stated. It does NOT say it is harder to cut. It says it stiffens it so it is easier to cut. Please re read it.
The hot towel was explained above - it is NOT because it feels good - please re read that too.
Dragging an edge along the nail is used to check for smoothness - not remove a wire edge.
I'm not sure what you're looking for specifically so maybe just ask. You seem to be focused on the "folical" (its actually the cuticle or outside layer of the hair)
I have answered your question about the hair twice now, once giving the real answer quoted from the Barbering Textbook above (it softens it) and secondly that what you are gleaning from the other book does not say what you think it does.
That's it for me here it drifts the thread away from its intent. If you wish to discuss this further you can PM me.
You started the drift.