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While I have personally just dropped the topic from my syllabus
(unfortunately FLUIDS in general seem to be a casualty of the 'less is more'
movement), when I did include the topic I included both effects. I haven't
had students do calculations for many years (and then they were Bernoulli
back-of-chapter calcs) so I have no sense of the proper mix of pressure
versus delta-p, and take it from the BDA discussions that this _simple_ view
is fundamentally flawed anyway.
So if there is an ultimate question in all this, it is: What (if any) is
the 10-15 minute discussion that can adequately convey the essence of flight
to introductory physics students (even those in purely conceptual level
courses)?