I had not thought much about it until now, but when I did, I guessed it was a cost-cutting move, as it seems to piggyback on equipment needed for other features

I had not thought much about it until now, but when I did, I guessed it was a cost-cutting move, as it seems to piggyback on equipment needed for other features (principally ABS). Now that you've mentioned it, I'm wondering if the auto manufacturers needed to get a bunch of regulators to drop secondary/emergency braking requirements in order to do this?