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@Tjuice
Yes, must admit, the same thought went through my head when I was walking to the station yesterday (strange the things you suddenly mull over when you're not on your bike).
Having said that, it does assume that the propulsive force is spread fairly evenly across all the sprocket or chainring teeth that are in contact with the chain, rather than the majority of the force being applied to one chainring tooth and one sprocket tooth (which, unless I am imagining this wrong, would happen if the chain spacing were marginally greater than the tooth spacing).
Been a long day, so ignore if I am being totally stupid / nonsensical.