First of all, we know that the current drama arrangement, how many parts to shoot and whether to shoot their whole body depend on the director. It doesn't mean that their superb performance can shoot their whole bodies. Sometimes it is unnecessary, which will not only distract our attention, but also shoot distant scenery together, which will lead to people's distraction and often notice some irrelevant content in the background.
Secondly, when these stars are shooting, their lower bodies may often wear very thick or thin clothes, and their overall performance in the camera is definitely unsightly, and we know that ordinary actors often shoot out of season, which means that the performance in the play is summer, but it may actually be winter or autumn, which leads them to wear some cold-proof equipment when shooting. Or reduce the clothes in the lower body a little, barefoot or wearing shorts. The TV series itself only shows the content of their upper body, so the lower body can often be adjusted according to the season and personal needs.
Now it's hard for actors to shoot, and often the whole crew has to follow these actors day and night. Therefore, when these actors are working, they are often accompanied by many crew members to help them solve some problems in temperature or physical comfort. The sweaty scene we see on TV may be that they are facing the autumn wind, but they just wrap a very big quilt around their lower body to urge them to sweat so much. So we still need to respect the performance of actors on TV. After all, any of their performances are hard-won. Because they need to overcome the tension in front of the camera, the surrounding environment and temperature and other difficulties. They also try to present the best performance for us on TV.