> Why would I fail to include driving with untreated narcolepsy in my definition?
It’s an illiterate example not a literal one. The point is trying to state the full set of behaviors that represent safe driving will fail.
> The definition wouldn't need to state "and doesn't fall asleep", because abstractions like "being attentive" and "anticipating things that might go wrong" already cover that.
And here you failed, “Being attentive” is a proxy for the behavior you want not inherently valuable. Information saturation also results in accidents, though this is more commonly recognized in aviation the same is true of driving.
Specificity is required not just platitudes.