That doesn't really prove much. The classification is the heavy part that needs acceleration. The algorithmic side would probably not need an accelerator, as it's basically a decision tree.

My original point was that the decision tree should hopefully degrade gracefully as the prediction quality goes down, and not have any brand that leads to an insane behavior.

Now obviously, the better your predictions, the better the driving will be, which is why you'd want NN accelerators.