When you ask these same engineers how much current flows in a transmission line, your question is often met with a blank stare. Lest you underestimate the importance of the flow of current, I would like to point out that charged particles at rest serve absolutely no useful purpose. You can store charged particles in a Leyden jar, or you can watch them attract pith balls, but you can't really do anything with charged particles unless you put them in motion. Both involve the transmission of electrical energy. No, you see packages, connectors, component leads, pc boards, wiring, and power supplies.
Most digital hardware is devoted to interconnections.
The interconnections, by hooking together the logical operatives, define the functions of a digital machine. The interconnections then communicate those functions to the outside world. When you look at a digital machine, if you are not looking at the interconnections, you are missing one of the most important parts of the structure.