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correct me if I am wrong but won't the FCW activate even with AP on if you come up on a rapidly decelerating or stopped vehicle? Or at least the warning will come on to make you aware to take action.

It AP TACC is following a car, it should be able to brake soon enough and hard enough that FCW and AEB wouldn't even be a factor.

If FCW came on, it could actually make matters worse because the driver would be prompted to step on the brake. At that point, due to Tesla's design of AEB, the AEB would stop working. A human responding to a FCW warning would not be faster at braking than an AEB system would be.