I disagree, everyone know that you can't trust cinematic trailers as they tell you nothing about what the game is like. But a gameplay trailer and what is said in them you ought to be able to trust, because you don't expect things to drastically change, unless it's like extremely early alpha.
If you watch this short early access gameplay trailer from Divinity, you would expect to be able to do what is presented here. And I think most people that have played it, would agree that it is pretty much spot on. Notice they state that choice have consequences.... but also that some more than others.
You don't get that impression from CP gameplay trailers, interviews etc. So why would people be fools, if that is what they keep saying?