It's even deeper than that - the whole idea of "learning loss" is against a presumed baseline that's somewhat arbitrary and doesn't take into account kids' different life circumstances to begin with.
Seth Truegera) when people talk about pandemic learning loss from distant learning, what is the counterfactual? what would have happened if kids kept going to school where lots of people got sick all the time? b) vaccinating kids & teachers sounds like a great way to do in-person school safely