I delight in being rather stereotypical mumsnet in alot of my views :) but this is one of the few topics where me and mumsnet majority part ways. School attendance is important, but schools are not factories, nor are children and parents slaves to the government and it's systems.
Its gone a bit wrong somewhere, as i suspect the people who do need to have school attendance enforced are untouched by new measures, and all that's happened is that families who support education have become more fervent.
I had a term off at a time growing up, through primary and secondary, as well as numerous one week and two week absences. Not saying that is in any way ideal, but I didn't have problems in catching up or in reaching my potential. I don't actually think it effected my learning whatsoever, though it did effect socialization & I wish I'd had a helping hand / bit of understanding about how hard it is to join in established groups as a child.
I didn't have alot of extra attention or extra lessons, I had no extra help in primary school, and I had two x 15 min sessions in science and the same in history, in morning break times when I got back. That's it. One hour of extra teaching time! I worked through the exercise books and my dad helped me do maths homework after. I was lucky in that I came from a thinking culturally rich family and above average intelligence. But even so, it was shocking how little I needed to catch up on.
To be clear, it wasn't ideal, it wasn't what I think anyone else should do unless they have to, and if everyone did that, classes and teachers would suffer.
But i do think people over estimate the amount of actual subject learning that happens in a school day (as any of the great home ed parents will testify), and also they under estimate the ability of a teacher who really isnt going to be derailed if children are away for a week here or there, especially when you consider how many other streams of work and the multitude of things going on at any one time in the classroom. The idea that everyone must be at exactly the same level at all times isn't happening anyway as part of modern teaching, and it's not a practical or useful aspiration.
The slavish idea that everyone must attend school every second of every day or the sky will fall... Well, I think it plays into the hands of politicians very nicely.
I hate to think what would happen these days to my parents though, the meetings and threats and censure they'd go through. On top of having a child in and out of hospital and 22 operations before the age of 18. At least in those days people were allowed to be humane about it and realise that having a living child is more important than having x number of days in attendance.