Cuz it doesn’t allow the car to accelerate as much but keep a normal speed that other cars can calculate distances etc as well as you. In the other hand, constantly braking and lifting the brake (stops/slows and starts while rolling) makes you and everyone have to think and decide if they have to brake to avoid collusion.
Tldr; everyone rolls in a small speed smoothly instead of everyone braking all the time unexpectedly.
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