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RE: Your thoughts please.

If one goes so far as to measure wire with appropriate gear, one finds the propagation speed is set by the repeated series L and parallel C effect of a long set of conductors. Once a set of wires is approaching a wavelength or more, it is / has transitioned into what in engineering is called a transmission line. Unless your 'Ma Bell or installing an antenna, you never deal with cables long enough to be transmission lines.

In coax cable (at radio frequencies all the aspects of cables are much more important as they increase in importance / magnitude with frequency) they often specify the "propagation velocity".

Lets say you have a coax cable that goes around the earth and it has a PV of 66% (slow coax) and now you put a signal in at one end and waited for it to emerge at the other end, you would have waited about 2/10 of one second for the signal.
In other words, cable propagation speed is not an issue withing a living room.

Cables do have effects but these can be easily measured and the effect they have on the signal can be measured or auditioned by listening to the difference between one end and he other or the effect they have on the driving source.

If your concerned about electron flow, that view, consider a wire is like a ridged pipe full of water, if you force water in at one end, nearly instantly (at the speed of sound in water) that pressure reaches the other end. The speed the "electron pressure" travels is near the speed of light.

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