He explains that in the 80's all tracks were straight and in one direction per layer with links rather than anything running perpendicular, and that this is when auto routing was invented and worked quite well. Now that no one uses that anymore auto routers have become a relic from the past, and you are always better off hand routing.
Like this at 26:00
https://www.youtube.com/watch?v=HKNVIgs ... c2fd6CYqGi
This is a good one because he points out all the nick-names the designers gave the chips.