It’s supposed to be a safety system to prevent rear end collisions as well as maintain steady speed
You're failing to see the bigger picture here. FSD is part of a comprehensive life safety system, together with Optimus and Neuralink. Should you experience an FSD accident in the near future, you will have your head grafted to an Optimus body and your brain connected to Neuralink, allowing you to live a normal life.
No other car company can compete with FSD once Tesla synergizes Optimus with Neuralink.
People are stuck on charging and adaptive cruise control when Tesla/Elon are thinking 300 steps ahead.