Re the 'my DC had 10 days off with covid and that was far less disruptive to their education than mitigation measures' argument - that depends on what you mean by disruption to education.
If you're looking at it from the perspective of your 1 kid being off and then back at school, that may seem to make sense.
From the perspective of people working in schools, it's not just 1 kid, is it? A massive workload goes into managing kids who are off school with covid, not least because they're supposed to be provided with education and checked up on. Those people should be doing other tasks.
Re teaching: it is incredibly disruptive to have pupils off on a rotation. As covid spreads throughout the school it's not all pupils off at once, it's a constant churn. The pupils left - you need to decide whether to teach them new stuff or not. Energy is spent catching up the pupils who were off. If you have the misfortune of working in a school where pupils who are isolating are supposed to 'dial in' to the lesson, well that's every lesson made worse for the kids in the classroom.
And that's before you get to the teachers catching covid and needing to be covered. Some pupils can end up going from supply teacher to supply teacher. Some end up in the hall being 'supervised'. Some end up being sent home.
And this drags on and on. But sure, your kid was back after 10 days so 👍