I believe it's hard to appreciate the frustration and costs that closing schools causes, at least for children to be too young to be left without supervision.

I can't think of any other measure that gets even close. The effects of restaurant closures can be mitigated by throwing money at the problem. If you have to stay home and take care of children, your career will suffer even if you are compensated for lost income.

There really isn't an easy solution to it. Maybe getting creative on the local level would help: taking turns among a (small) group of parents, or hiring a single person to take care of maybe 5 or 6 kids. Maybe getting the older children to watch the younger ones, etc. But everything comes with its own drawbacks, usually by reintroducing pathways to spread.

One measure that seems to be missing, and that I cannot find fault with right now, is changing structures to keep classes fixed, possibly with only a single teacher (per week?). For younger children, it's quite possible for, say an English teacher to also teach biology. Having fixed classes is also common in many countries. It means you can't accomodate electives, of course.