Hours are interlinked across society. If you drive your kid to school, you need that to roughly line up with when you go to work. Maybe you don't have this cons

Hours are interlinked across society. If you drive your kid to school, you need that to roughly line up with when you go to work. Maybe you don't have this constraint, but your coworker does, so if they were to keep the existing hours, you have some incentive to keep the same hours too, etc.