It seems to me that a large number of children will have disrupted / part-time schooling anyway this winter.
Children will be sent home every time they have any Covid-like symptoms, and will have to be absent until they say they have a negative test result.
Teachers will also have to be absent if they have symptoms - no more struggling on regardless.
Classes or year groups or school will close due to a couple of positive tests.
Children will have to self-isolate with their families due to positive tests within their family.
There will be local lockdowns.
All of these - except the first, which is inevitable in colds season - are reduced if community transmission is lower, and community transmission will be lower if the school environment is carefully and genuinely controlled - through reduced numbers, physical distancing / barriers, increased cleaning, mask wearing and careful management of key points such as school buses.
it seems to me we can either have chaotic, random, uncontrolled interruptions in schooling OR we can have controlled and predictable ones, for example through part time attendance and part time remote learning. We can either have the costs of adapting schools and paying for extra cleaning, more sinks, more buses and PPE OR we can have the costs of sick pay, supply teachers and local lockdowns.
We can't have full time, predictable, 'schooling as it was' through assertion alone.