I read up on it a few years back. Long story short, the number of “T-bone” type accidents where the side of the car gets hit decreased, while the number of people getting rear ended significantly increased (allowing that some rear end collisions also go unreported due to lower degrees of damage.)
There was a whole rethink of the use/benefits and disabling/not installing them further, but I can’t remember the outcome.
Like I said, I spend a lot of time driving, so forgive me for not pulling sources in the middle of my work day. Gotta drive to the next patient’s house lol.