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"Drafting" means one cannot see far enough ahead to make the changes necessary to enable a safe and uneventful trip.
And, believe me, an empty 18-wheeler can scrub speed faster than one will envision.
To get back to the topic, make it about having loaded ones vehicle and/or towing a trailer fairly heavy for the vehicle, being to read the road surface ahead at highway speed is part of reducing steering inputs. Same in accounting for winds. One wants a fairly quick return to center with the steering AND as much space ahead to do it gently. Remaining lane-centered, dead-on, is the goal. Sane for coming down in speed well before an exit or construction (for which one has warning), and for the emergency slowing in the event of a wreck or ice, etc; as signalled by vehicles ahead.
In short, just as one cannot have too much fuel aboard, one cannot have too much space out ahead to both read and react to changes in conditions.
What gets hairy is the combination of adverse conditions. This is where bad habits kill people.
Drafting is a bad habit.
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