Saying it is a safety feature is a bit of a long bow, in my opinion.
Saying that someone is travelling too close is also a bit on the stale side, as regardless of the distance if the car in front is braking you should also apply your breaks.
Mentioning that it is a "lower cost" solution is where I think you hit the nail on the head.
So Hyundai , Kia , BMW, Mercedes plus others, can all find the cost but Mr Toyota with the millions of cars they manufacture can't , sort of sums it up.
Thanks for your incite.