Do you think simulating those years and extrapolating the derived values from that simulation is clearly easier and simpler than extrapolating the values from e.g. a study of human neural scans/human biochemistry/human psychology?

It's not clear to me how the second is obviously easier. How would you even do that? Are there simple examples of doing this that would help me understand what "extrapolating human values from a study of human neural scans" would entail?