Likely because the "natural" way of thinking about this is in terms of how many times the rear turns, rather than the engine, with higher gears meaning more turns?Then why does he not know the higher the numerical ratio number the "lower" the gear?
The ratio used for the "rear" end (whichever end it's really at) being measured backwards is a historical oddity.
As an engineer, it's "how much more can I finagle?"
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