"being on the inside of a turn is one of the more common causes of NFR
How, exactly, does being on the inside of a turn, "cause" NFR? That has to be one of the silliest things I've ever read here."
It's a quite natural result of making allowances for your partner's travel and upswing.
"When I step back, TH, and start to rise e/o 1, I do so with NFR."
I hope you don't always do that. It is after all an application defined action, and I'm sure our friend Don/Quickstep/Serendipity will be along to remind you of a very important situation when your action on the inside of the turn should NOT result in NFR.
"If I am turning, my heel will not release until I have my full weight on the next step, ended to the side, and I could hardly do otherwise; but if I was not turning, the rise would still be characterised by NFR."
But it would be a very different sort of NFR if you were not turning - you would roll your weight through the heel and release the toe.
"It wasn't "caused" by the turn, and has no effect on the way that the turn is executed."
On the contrary it clearly is caused by the turn, because it would be a very different type of NFR action if there were no turn - and in the case of one particular type of turn, it is not NFR at all.
It is the specific type of movement created into step one that determines the nature of the foot action which will occur upon arrival and dancing through the foot. Two of the common situations can be characterized by NFR, but they are still two very different sorts of NFR.