For many online school families, they have struggled with this for years before COVID and will continue to struggle with it after; we are designing this program precisely to address this challenge.
I also wanted to address the last part of your comment: all kids of the same age learning the same thing is indeed a disadvantage of today's traditional education system. I hope you'll agree that there's nothing biological about 10 year olds needing to learn the exact same thing at the exact same time. Children proceed along unpredictable paths of learning at unpredictable paces and our jobs as educators (or in my case, as someone who supports educators) is to enable as much of that flexibility as possible for the children.