Leuf wrote:

And beyond that, why fire a pin into the expensive blade? Why not
have a cheap steel toothed disk somewhere else on the shaft and fire
your pin into that? Perhaps the diameter of it would have to be so
large that it would affect the depth of cut.

If you stop the shaft rather than the blade itself, the blade will
continue to have inertia. This may be enough to spin the arbour nut
loose--especially when using dado blades.

Chris