It seems to me that the biggest issue are the start and end times though - we could surely structure work to have more flexible start and end times while keepin

It seems to me that the biggest issue are the start and end times though - we could surely structure work to have more flexible start and end times while keeping most of the day fixed. As for school hours, there have been plenty of proposals and good reasons to change them, and it tends to meet the fate of 'too hard', but I don't see why that's actually true other than people being unwilling to make meaningful change to how we do things (status quo bias).