DaveVa
2012 Sig Perf #236 VIN#484; 2018 P100D; 2021 Plaid
+1 and maybe I'm going to throw a bomblet but....these aren't really about making a car safer, it can be argued that it's about making drivers lazy. (No-one take that personally, please!)
No offense taken but if you know you're an occasional lazy/distracted driver, these features are indispensable safety features. To take it one more level, I want full stop ACC - I've seen it on a friends Volvo - pretty awesome. Lazy - yes, but way cool.
My guess is that ACC will be released, but after the initial deliveries. I am hoping that the current discussions/belief that it will be compatable with earlier vehicles is true.