At this point, the advantage of painless delivery lies in less pain and less physical exertion after delivery, so Americans recover their physical strength quickly after delivery and leave the hospital early.
The second reason is that the incision position of caesarean section is different. In the United States, most pregnant women will choose a straight incision, while pregnant women in China generally choose a side incision, which has higher requirements for doctors. Its advantages are less injury and less bleeding. Therefore, even if everyone chooses caesarean section, pregnant women in the United States will recover their physical strength much faster than their mothers in China, so naturally they don't need confinement to recover their physical strength.
The third reason is that people of different races are different. For example, blacks are typical of short waist and long legs, while Asians are 50-50. American women have bigger pelvis than Asian women, so they have smoother babies, and they usually have more exercise time than China women. Women who exercise regularly will give birth to smoother babies than women with weak constitution.
The United States also attaches great importance to prenatal and postnatal care of pregnant women, so American mothers should study before giving birth and go to various health centers to recover after giving birth. With professional knowledge as the foundation, they can get out of bed and walk quickly under the guidance of doctors, while most mothers in China will faint when they go to the toilet for the first time after giving birth. So that's why mothers in the United States don't need confinement, while mothers in China need confinement to recuperate.