Kids deserve to be with their friends no matter what gender. Although the school principal feels like this is helping with the schedule, it should still be considered that the students do not enjoy their recess or lunch as much as they used to. When both the boys and the girls were allowed together during recess and lunch, they found it more enjoyable. Students care for their friends and if their separated, they can't hang out with the people they desire to. Children want to see their friends.
They're always told, "You can hang out with your friends at recess, so stop talking in class." It's not their fault that they want to talk to their friends with opposite genders during class. They were told they can see them at recess, and they expect to be able to. And if they can't, then it's not surprising they want to talk if the opportunity is given to them. Now, they would have to plan something or try to contact each other so they can talk after school, something that some of them don't have the time to do. Kids at the school want their original recess and lunch back because they want to see their friends again just like they used to be allowed to.
