While ACC is handy, I want to point out two concerns.
I can anticipate undulations in the road and traffic with much more accuracy than the ACC.
1. As you stated, I make it a point to anticipate changes in traffic flow and usually sooner than the ACC computer. This allows me to brake or accelerate more smoothly than how the ACC works.
2. When the ACC slows the car down, do my brake lights come on? That would be a very important signal for those behind me to match my down speed.
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