OK try THIS one :
when there is lift there is drag and when there is lift or drag there is a pressure differential. You may not think what I said is true but you would be hard pressed to proove your point in an open debate . all three are irrevocably linked

Efficiency is what you go to airy plane theory school to learn. This is where you get lost in seeing the obvious.
You say lift and drag are always in concert .
I say they are simply parts of an orchestra.
perhaps we should coin a word which suggests they are one. - -
how about - drift?
Sorry that one has been taken
-I'll work on it.