What does this have to do with the original topic of this thread?
Why is it at all important to know which direction electrons are moving in a circuit?
And what circuit elements have unknown directions of current? Every element that I can think of has a pretty obvious direction of electron flow once you understand the circuit it is placed in.
It is incredibly important to know the direction of Electron Flow, especially in Nano Circuitry, when sequencing of Active devices on this scale is crucial.