Hyper-individualist cultures go, “Your emotions are your personal responsibility. Don’t burden others. Regulate privately. Maintain functionality. If you’re upset, process it offstage so the machine keeps moving.” Meanwhile certain collectivist or harmony-focused frameworks go, “Your emotions disrupt group cohesion. Don’t create discomfort. Don’t impose disharmony. Transcend or contain your reactions for the sake of the whole.”
Different mythology, same trembling fear that one person saying “actually, I feel terrible” will cause civilization to peel apart like wet drywall.