Yes, there is some variation in opinion in how the findings can be interpreted but most of the differences between 1916 and now would be due to that now we are MASSIVELY more rigorous in our approach to such findings.
The smug is strong here, and it's unfounded.
Science and engineering is easy. You want to study something and observe it's properties? Build it, run an experiment, and do it. Do it a dozen times, or a hundred. You have the luxury of amassing a supply of data that is orders of magnitude better than what an archaeologist could collect from a lifetime of digging up middens and graves, so there's far fewer blanks to fill in with supposition and conjecture.
I didn't say what you attributed to me. Have you ever read anything from that period I referenced at all before you declare me to be ignorant?
Take the facts gathered and put them in front of a British archaeologist in 1916. You would get a different interpretation, or a variety of reasons.
Prehistorical "history" is more a reflection of what we think than what happened thousands of years ago.