Milliedog
Ex primary school teacher here.
So, I have an imaginary class of 32.
A child misses a week of school. He writes a diary of his activities. Great. What's not so great is that the rest of his class has covered some basic but important maths. When he returns to school, how will he catch up with that? Am I expected to give up my break and lunch time to give him some private tuition? Or does he skip it and it affects his future learning (I also tutored children whose maths had suffered because they'd missed an essential 'building brick'). Now imagine - each of the 32 children taken a week out of school to go on holiday. That's 32 times I have to give 'private' unpaid tuition to. And then, to add insult to injury, I have to pay premium prices to take my own children on holiday in holiday time. The word 'furious' doesn't quite cover my reaction....
Exactly the situation I described above, Milliedog Every child is the one child that their parents deal with. They can imagine the teacher spending time focussing on explaining long division to their son or daughter, one to one, after a week's absence, but if the same teacher neglects their child at the next challenging session because they we concentrating on other children who had missed the long division, they would be on the school doorstep first thing next morning.
PS I am sure people of a certain age, particularly primary teachers, remember that long division is/was a complicated operation, which was taught over several lessons, each of which was dependent on the class remembering the previous steps learnt. No skipping a week!