I think it's a legitimate problem though that schools and daycares operate predominantly on a five day schedule now that works for a large number of workers. If we go to a model where we have something resembling a 50/50 split between longer 4-day work weeks and shorter 5-day work weeks we end up with a huge problem in how to schedule services so that they work for the majority of people.
There will be overwhelming pressure on schools to have days that match the shorter length of day in the five-day workweek so that parents who opt for five days can spend time with their kids. There will be overwhelming pressure to have four slightly longer school days so that parents who opt for the four-day work week can spend time with the kids on the three days off. It's very difficult for schools to opt for both solutions as it would require doubling the number of class types being offered which makes it harder for smaller schools to have sufficient students in every class to be financially viable. Even if we solve financial viability schools would need the ability to tell teachers which schedule they had to take rather than letting the teachers freely choose.
I can't stress how much this choice of working approach would be bad for the school system.
I can't help but feel that you are arguing that it would be hard on everyone if the current standard was not maintained, while ignoring that the current standard is not maintained.
Here are occupations that generally don't have a M-F 9-5 work cycle right now:
police, firefighters, the vast majority of people who work in healthcare including nurses and doctors, restaurants, hospitality, janitorial, retail sales, plumbers, HVAC techs, construction workers, taxi/lyft/uber/whatever drivers, truck drivers, and customer service.
I actually prefer a four day school week and four day work week as a standard I just don’t think it’s easy to have multiple simultaneous standards.
I get that not all jobs are M-F 9-5 workloads. But I also know a number of people report substantial hardships of not having that schedule in those jobs. I don’t think we want to make school no longer correspond to the default work week by having two default work weeks unless we want all people on the wrong default to add those problems to their jobs.
There will be overwhelming pressure on schools to have days that match the shorter length of day in the five-day workweek so that parents who opt for five days can spend time with their kids. There will be overwhelming pressure to have four slightly longer school days so that parents who opt for the four-day work week can spend time with the kids on the three days off. It's very difficult for schools to opt for both solutions as it would require doubling the number of class types being offered which makes it harder for smaller schools to have sufficient students in every class to be financially viable. Even if we solve financial viability schools would need the ability to tell teachers which schedule they had to take rather than letting the teachers freely choose.
I can't stress how much this choice of working approach would be bad for the school system.