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except a human driver in front of the Mach-E did see the car and avoided it successfully.

That makes it harder for the car behind. The Mach-E is following a moving car, which is blocking the view of the stopped car. She swerves out of the way, and the situation goes from everything normal to disaster in half a second. A difficult situation for humans or autonomous system.

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The Mach E just shouldn't have been following the way it was. Autonomous systems need to maximize their road information, not follow social trends (i.e. not follow closely on the highway at the sacrifice of visibility)

That can be true, while also being true that a moving car in front of you can better see an obstacle while obscuring it from the car behind. I’m just saying that the car in front that avoided it was in a different visibility situation to respond than the following car.

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