Doesn't seem to be a problem from that angle at least. Sounds like FUD.
The update has the bad habit of reverting settings that you specifically configured, and persisting settings that should be reverted. For example, if you use other virtualization solutions, you probably turned Hyper-V off since there's conflicts. The update turns it back on for some reason without telling you which can really mess you up. Next, Fast Startup is re-enabled even if you disabled it because it's broken (which it is for me). Lastly, Cortana is designed to be enabled all the time with this update, and the UI switch to disable it is gone. The problem is it should turn itself back on, otherwise it is difficult to determine how to do it without the UI. Sure, keep the registry setting so users who want to risk going into unsupported territory can keep turning her off, but the update really should switch things back to supported territory...
Traditional cruise control allows you to pick a constant speed, so I would expect it at least can do that. I would also expect the car has no way to know the posted speed limit of the road, thus the driver controls the speed of the car (that said, we have most of the pieces needed to make that work, and in fact I bet self-driving cars in testing do this, but for "semi-autonomous" I expect it's not worth the trouble to implement since any way you do it you need a bunch of extra equipment on the car to figure out what the speed limit is, which makes the feature more expensive... or the user can just set the proper speed himself for free.)
In the end it's the driver who is responsible for the actions of his car, as far as he can control them. The only things I can see wrong with autopilot with everything I've heard so far is the name, which may tempt a driver to assume it does more than it actually does, and the fact that giving a driver less things to concentrate on while driving can be dangerous in some cases if they still need to be able to react.
"I have just one word for you, my boy...plastics." - from "The Graduate"