The fundamental problem here is that when we chose to shut down society, most of the capacity that went unused is gone and cannot be brought forward into 2022 to fill in the gaps left behind. So for example, all of the teaching time that was wasted on ineffective distance learning or just didn't happen is gone. Want to organise a bunch of catch up sessions? You'll have to find a bunch of extra teaching time from somewhere (and likely a bunch of extra teachers) on top of normal teaching along with extra time in those kids' days - easy enough to do small scale for a wealthy few, much harder for all of society.
The same has happened everywhere, from factory production to restaurant meals and hotel stays, which limits our ability to pay teachers to do this - in order to pay them more in real terms they have to be able to buy more, but the amount of stuff available to buy isn't even enough to support people's existing quality of life. Any attempt to pay teachers generous overtime to teach extra would have to come out of other peoples' real-terms income in a world where that is already dropping for most, and the bigger the program the more painful and broadly felt that would be.
The same has happened everywhere, from factory production to restaurant meals and hotel stays, which limits our ability to pay teachers to do this - in order to pay them more in real terms they have to be able to buy more, but the amount of stuff available to buy isn't even enough to support people's existing quality of life. Any attempt to pay teachers generous overtime to teach extra would have to come out of other peoples' real-terms income in a world where that is already dropping for most, and the bigger the program the more painful and broadly felt that would be.