I used the ACC with automatic speed recognition for about two months but it did too many stupid brakings. I think using GPS to limit to the highest possible speed for highway/roads/city would be fine. But as long as the car can decide that on this highway it really thinks the 40 sign is for the main lane and not the off ramp, I would rather not have it
I guess you are right it is the same problem really. Where I live you could at least limit it to 80km/h in the city limits since there is no higher limit anywhere. But more granular limits might be hard