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> Especially since the effects he's describing are probably (as mentioned in this video) because of capacitance, and are completely dependent on the 1m distance between the wires across the entire span, a constraint he mentions basically once and then never again, and never says explicitly that it's related to the effect.

YES. This is my biggest gripe with the video. A better shape of wires would be a pair of tangent circles, each one with a circumference of 1 light-second, and a 1-meter section removed at the tangent point. (Hope I'm describing it right. Basically but only the switch and the light bulb 1 meter apart, but get the wires as far apart from each other as possible)

Now would that eliminate capacitance? Or largely so? What amount of current would begin flowing across the bulb at t₀?

After seeing that video and all the reactions, I know more—but not from the original video. My mental model of electricity is still that it "flows along wires", but I now can somewhat separate the movement of charged particles from the energy flux those moving charges propagate. I think.