They don’t do human in the loop at highway speeds.
Further the cars need to safely stop in an emergency without human intervention. There’s no way for the car to first notice a problem, then send a message to a call center which then routes to a human, and for that human to understand the situation, all fast enough to avoid a collision. Even 50ms is significant here let alone several seconds.
That's not an achievement. Even a non intelligent low to mid end compact SUV such as a 2024 Mazda CX30 has cruise control that can detect cars stopped ahead to slow down, stop if necessary, and continue when the car in front starts moving.
I'm just saying that "it avoids a collision" by not ramming into people or cars is table stakes and it makes us look incompetent if we tout it as a flagship feature.