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Clarity about forces can (nay, must) be achieved by
identifying in every case _which body is acting on which
other body_ -- cf. N3!!! This preempts any confusion
about "the" force at the A/B boundary.
In this light, I object to your making this
conceptual view "mandatory". One man's conceptual
clarification of an equation may be another's
confounding weirdity. Physics preaches no conceptual dogmas.
If I understand John correctly -> us rattle off as N2, F=ma.
He is trying to DOWNplay the equation that most of