Hey, try this sci-hub link:
The thing is that culture is uniquely human. No other species has built institutions transmitting behaviour, beliefs and knowledge down generations. So you need an explanation of what is is about humans that allows culture to form.
Ok, I've read this now. Some thoughts:
The analysis of the ontogeny is convincing, and the model of shared goals is good. Also, from what I know about chimps and bonobos (I've read widely, have no direct experience), the summary of their activities seems pretty fair. I also agree with what they say about how language is acquired.
However, this statement doesn't stand up:
Although nonhuman animals may engage with one another in complex social interactions in which they know the goals of one another and exploit this, they are not motivated to create shared goals to which they are jointly committed in the same way as humans
And this statement shows why they've missed it:
although apes know that others have goals and perceptions, they have little desire to share them. They can interact with others triadically around objects, but they do not engage with others in shared endeavors with shared goals and experiences.
They've failed to consider anything other than other primates because they somehow see primates as the Himalayas of evolution with humans as Mt Everest. That's a bad mistake. They don't consider orcas or humpback whales or sperm whales or elephants...
Taking just orcas, their behaviour suggests triadic engagement with one another in pursuit of a collaboration with a shared intentionality, recognition of each other's role, etc. Pod-specific hunting strategies such as those captured by Frozen Planet 2 involve all of this. And they are clearly cultural.
If I might indulge in a bit of evo-psych (!!) myself, one could compare the hunting strategies of humans going after big game in coordinated groups with the hunting strategies of orca going after the big game of the oceans. And one could see the development of supercooperation within both species as a result of the same evolutionary pressures.
I see that they hypothesise group selection as the way that collaboration came to dominate. Martin Nowak has done mathematical simulations on this and reached a similar conclusion. It provides a good explanation for the dominance of collaborators as game theory predicts it.
One final thought concerns sheep dogs working with humans. I don't know enough detail of this to say exactly where it lies in the spectrum of collaboration and joint intention. Quite a long way along the road, I would think.