Standard disclaimer applies: I am not a parent or teacher.
Kids need a break in their day. Kids, especially little kids, can't sit still for that long without a break. Recess gives the kids a chance to run around a bit and use up some of that boundless energy all kids seem to have, so they can return to the classroom ready to resume learning. If you're familiar with the 7 Habits of Highly Effective People, recess is a way of sharpening the saw.
Recess also gives the kids a chance to have some social interaction, which is important for the development of interpersonal skills.
I'd like to see the school district rule that this official is not permitted to take any breaks in her work day other than 20 minutes for lunch. No long lunches, no running errands on her lunch break, no smoke breaks, no stepping outside for some fresh air, no chatting by the water cooler or coffee maker. Let's see how long she lasts under those conditions.