Yes you can keep going a bit further, but that's still the lumped element model. The problem is when you analyze something like a transmission line - like that

Yes you can keep going a bit further, but that's still the lumped element model. The problem is when you analyze something like a transmission line - like that circuit presented in the video. Or a PCB with very fast signals where you have to understand that the energy moves through the insulator, not through the conductor, or the circuit will not work. One way to look at this is that there is no such thing as a hose for electricity. It cannot be confined to a conductor, even if it is also wrapped by an insulator. It is only mostly confined. And this is not some failure of materials engineering that we may overcome one day, this is just how this stuff works. BTW, the answer in the video is 1/c seconds, i.e. one meter worth of speed of light. And the lightbulb will experience current determined by the impedance of the transmission line. Then the fields will do a full wraparound the ends, at which point the circuit will start stabilizing around the resistance of the load. It can take a few back-and-forth iterations to stabilize the current.