A big caveat to this study is that, in the reconstructed simulations, once the self-driving car (SDC) deviates from what the human-driven car did, the behavior

A big caveat to this study is that, in the reconstructed simulations, once the self-driving car (SDC) deviates from what the human-driven car did, the behavior of all other agents becomes unrealistic. Often in these sims, instead of reacting to the new SDC trajectory, they replay their original behavior. Ideally, once the SDC deviates, all other agents are simulated as well. A tall order, but necessary if these counterfactuals are to hold weight.