Suburban lawn care has been going on for decades, using largely the same approach it always has. Mainly fertilizers applied once or twice a year if you bother to care. Broadleaf weed killers, maybe grub killer. The primary way to getting a nice lawn, though, is to overseed so often you choke out weeds. On the other side of the coin, agriculture is engaging in a broad spectrum application of herbacides, pesticides, etc with new formulas coming all the time. At an insane scale.
There is no comparison to yards. It's agriculture.