[Retric]

One possibility is humans actually have more training time in go to fine tune things than computers so far. 6 hours a day * 300 days * 5-20 years is a lot of training, but multiply that by millions of people who don't all come up with great models.

The idea being people with better heuristics end up as better players adding. So, more people effectivly adds more training time backing up the best models.

PS: This also means each player is using a different algorithm while playing.