@Lumene
What is your alternative suggestion OP?
I would in the first instance;
i) Be much less strict about isolating entire year group bubbles; every school in our area that has had a +ve case has isolated the entire bubble, often hundreds of children at a time. Perhaps just identify the children who had been in a class with that child?
and if it became obvious that children were having repeated bouts of isolation inflicted on them (ie 2 days in, 2 weeks off, 3 days in, 2 weeks off)
ii) revert to home learning, but make sure that schools are delivering live lessons; a lot of the reasons they didn't last term were fears about safeguarding, and if they were directed to do this by government then safeguarding would be less of an issue.
I think it is better for children to be in school than not, but not if the cost of a few days in school is repeated 14 days of isolation at home when they can't leave the house.
The worry for me is that the government have put a lot of store in 'keeping schools open', which is a good aspiration, but if the impact on children is hugely negative then they need to consider that.
As an example, a year 7 class in my area has all been sent home to isolate for 14 days following a +ve test. These children have likely been out of school for 6 months, they've come to their new school, had maybe 3 days in school and now can't leave their house for 14 days. That's not good for anyone.