First, flight artillery and biology and just now hitting AL?

Usually, AL is a huge priority for me (infantry alone makes it worth beelining, it is draftable and pawns every older unit), so my production enhancers will stay active way longer than yours and I can asure you that I get AL on immortal way before you get all these techs.
Second, your typical base hammers seem low, my production cities are in the 50+ range, highly specialized.
Third, they usually have granaries and grocers (cheap, usefull buildings) and therefore,
there is no real health problem with enough ressources, which go hand in hand with an expanding empire, I didn't need something inefficient as a public transport in a long time.