Once enough time has passed to give proper retrospective stats, I am very curious to know if there is a clear dividing line between the harm of remote learning

Once enough time has passed to give proper retrospective stats, I am very curious to know if there is a clear dividing line between the harm of remote learning at the elementary grades compared to high school or college or if it gradually tapers off in later elementary school into the baseline education reduction in high school. I'll also admit to not thinking that a missed semester of school was a big deal. Why'd I ever think that? I only thought of the glacial pace of American middle and high schools and elementary grades simply skipped my mind entirely. There's no way to teach a child to read over Zoom.