In the scenario you suggested with an 8N chained to a garden tractor in a dead-pull, it is the weight and traction that lets the 8N prevail and outpull. Not torque.
Is torque important for many types of work? Yes, off course. A typical garden tractor rated at 26 horse @ 3600 RPM has 1/2 the torque as the 8N engine at 1600 RPM.
That being said, stick an 8N engine in the garden tractor, and stick the garden tractor engine into the 8N. If geared right, the 8N with the lawn mower engine will win in a dead pull. Again, due to the weight and traction.
In your description of using a 9 horse rated Cub to run the same mower the 26 horse garden tractor uses? Well yeah, they are equal sized engines, both around 60 cubic inches. The difference is, the garden tractor engine will outwork the Cub engine since it's capable of making many more internal explosions, and more horsepower. The Cub can only make around 9-10 horse on the belt and PTO. The garden tractor engine rated at Net 26 horse can probably make 16-18 on a PTO if geared correctly.
I'm not arguing the usefulness of torque. I'm arguing that torque does not allow one tractor to outpull another. It CAN enable one to pull faster with a given load.
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