Just vacuuming thoughts: The requirement to have some kind of permission to go pee in the middle of class is antithetical to teaching children that they should have and demand bodily autonomy, and instead teaches that authority figures are going to limit them for no other reason than the chance that someone who doesn't need to pee needs or wants a couple of minutes away from the classroom for any other reason, thus punishing the whole for the theoretical infraction of the few... At worst giving them pee issues and/or social trauma?

And also have you ever tried to focus on fucking anything while needing to pee?
What the fuck is wrong with you, just let the kids pee.