> Kids want structure, rules, boundaries. They will test them, which is good.

Oh yeah, totally. That being said, our eldest was super picky and changeable (and often didn't eat enough so it was a little concerning) so we often ended up with lots of staples that she one day decided she didn't like :shrug:

Mostly fixed now that she's older, but I can see how food waste happens. And more generally, if the kids get excited or distracted, there will often be waste.