That disclaimer used to appear, most recently for newer features like biking directions. It no longer appears for any directions. But, to be clear, I was referring only to navigation correctness (determining whether I'm on the right road) and not determining whether it's safe for me to be on that road. Here, automation reduces what is necessary for my brain to hold in its working memory, so its less capable of answering questions about the route.
However, my intent is not to absolve drivers. The driver is still "ultimately responsible." Of that there is no question, because Autopilot is not fully autonomous.
My point is that Autopilot renders drivers less capable, even while they remain as responsible. And Tesla, for its part, has it's own, different kind of ultimate responsibility: to avoid negligent design of their products, by disabling Autopilot on road types where the statistics show it results in a net increase in accidents and fatalities.
That depends on whether Autopilot is being used on a road that it is suitable for, or a road that it is not. On divided highways I would suspect that Autopilot, while still turning many people into zombies, reduces the accident rate. Autopilot works better here, and many people already zone out on the highway (the task is too boring), so having Autopilot also watching is a net win. When it comes to fatalities, not just accidents, the data is less clear, and hints at a different story.
On non-divided ("restricted") roads we have no distinct data sets to evaluate, but based on the poor showing of Autopilot in the most recent accidents, I personally believe that Autopilot is a net loss of safety. More net zombies created, less capable Autopilot.
