I’m not a teacher, but work in a school (Admin), DH is a teacher, and our two boys are primary and secondary.
We’re in France all slightly different rules, but tbh school is going much better than DH and I thought it would. Yes it’s chaotic, yes there are absences for teachers and students, yes it has been a learning curve, and it’s no fun wearing masks all day but... teachers are teaching, children are in school learning, life is carrying on. In our department of 20 employees this term, we’ve had two positive cases (both admin, one infected the other), two teachers isolating as contact cases (tested negative) and one isolating with symptoms (also negative). No positive cases in the teachers so far (some of them already had it though, back in March / April). It’s sustainable though obviously not ideal.
Nb here, masks are worn by all adults and all children over 11yrs. Plus the Isolation period for positive tests and contact cases is 7 rather than 14 days. This was a pragmatic decision to increase compliance.