Why do Leghorn hens simplify the low-maintenance aspect of egg operation?

They have largely lost the instinct to go broody

One significant characteristic that contributes to the Leghorn's status as a low-maintenance layer is their marked reduction in the maternal instinct to become broody. Broodiness in chickens involves the hen sitting consistently on a clutch of eggs, interrupting her laying cycle to focus on incubation and hatching. Because Leghorn hens rarely exhibit this behavior—they have essentially lost the instinct to sit on eggs—they remain focused almost entirely on producing more eggs. This sustained focus means fewer interruptions in production volume compared to breeds that frequently stop laying to raise chicks, streamlining the operation for those whose primary goal is maximizing egg harvest rather than hatching new birds.