Interesting paper and results, but this patently does not extrapolate to "smarter parts make collective systems too stubborn."
Try: "simulated, independent agents exclusively with left/right movements collectively begin to perform worse after they are able to remember beyond 7 prior moves."
I think maybe the author extrapolated a moral opinion ("too stubborn"), and then edited out everything that supported that opinion until left with just the confusing title.
Try: "simulated, independent agents exclusively with left/right movements collectively begin to perform worse after they are able to remember beyond 7 prior moves."