This has been obvious all along to anyone who has ever driven or used a computer before and thought about the reality for more than a couple of minutes. But the press and VCs bought into the hype from the likes of Uber who needed to keep generating huge new investment to stay afloat and Tesla which is run by a delusional snake oil salesman who had a single hit with the Model S. The shocking examples of crazy unexpect…
No-one can can predict what other people are going to do, and what other drivers do is also affected by what you do. Most drivers aren't even paying that much attention. Realistically you can't model that to any useful level of precision.
I think maybe vendors are trying to build a more deterministic system that can justify its actions, but to make autonomous driving actually work, I suspect you have to make it drive like human: taking actions "confidently" (i.e. slightly recklessly) assuming the world will roughly follow a rational model, while also driving "defensively" to cope with the general unpredictability of reality.
The price to pay for this strategy is familiar to human drivers: the occasional fender bender.