Well, if you look at the equipment of Chinese peacekeepers in the past, they had crotch armor:
View attachment 103194However I believe they got rid of it due to speed. Based on what I heard from Afghanistan and Iraq War vets, crouch armor sucks because it limits your motion and adds more weight. In combat and rapid reaction situations, you want to move quickly since the longer you stay in one place, the higher the probability of the enemy hitting you. I guess the Chinese learned that during their peacekeeping ops because they don’t wear that anymore.