I'm actually the exact opposite, I sent my elementary kid back with confidence, middle and high schoolers would be a much more difficult decision for me due to the class changes. My 2nd grader has 6 kids in his cohort and 5 in his latchkey program.
My decision would have been based on not wanting an elementary student to have this weird experience- tiny group/ maybe friends/ maybe not/ lunch behind a divider/ masks worn all day. Plus, I’m confident that I could keep an elementary student on track, probably ahead of where they need to be.
Middle school we probably also would have been good virtually. By high school, my kids were taking AP and dual credit and I’d have had tough decisions about whether the virtual was keeping them on track. I would not have felt confident that I/we could have supplemented if necessary. Plus, my kids were self sufficient educationally by middle and high school. I’m not sure that I would have even known if they were falling behind.