Causal evidence is basically non-existent in archaeology. You are correct that, deductively, we can conclude little more about society from this other than that construction took place. Archaeology attempts to collect all possible evidence and weigh the potential narratives. This can be especially effective at teasing out trends across many sites and cultures. Are we likely getting details wrong if we were to infer a specific society from these trends? Absolutely. We will likely never know most aspects of these cultures—but if that's your goal, even well-documented history will fail us. We know a lot about the lifestyles of european benedictine monks, for instance, because they were excellent record keepers, but we still can't answer basic questions about their lives.
Anyway, with this specific article social stratification is one of those things with little ability to extract a narrative from a single data point, but whose importance emerges when collated with others. And it does sound a bit editorialized for modern narratives, but that's probably not intended by the researchers.
> We know a lot about the lifestyles of european benedictine monks, for instance, because they were excellent record keepers, but we still can't answer basic questions about their lives.
That's why finding their garbage or where they emptied their latrines is often more insightful than finding yet another written record.
Only because they have left so much written record that we don't really expect that another record will tell us something we didn't already know. The less we know about some culture the more valuable written record would be - but often it isn't available. When we already know a culture well archeology can tell us where they ideals they wrote about themselves don't match reality. When we know nothing though, archeology leaves us with a lot of evidence that we don't really know what to make of.
Maybe. Though people rarely write down the things that we now find most interesting.
Have a look at very old newspapers or magazines. It's almost irrelevant today who won the latest elections or what scandal happened to whom; the old ads are typically the most fascinating part.
They said the lack of evidence of social stratification in the burial sites and house sizes contrasted with other sites near by. Plus remember this is the headline a news site chose not the scientists.
It's very plausible journalists (including university PR teams) care more about social elitism than the archaeologists which is why it's the HN headline. The archaeologist is just using the only evidence they have which is some pipes, a cemetery, and few remaining structures to extrapolate about the community.
The fact that construction and some planning took place seems to just be evidence that some planning and construction took place.