There are many good uses for schedules.
But for me, at least, schedules can be difficult--they can feel restrictive. I suspect this to be the case for others.
One way I like to think of schedules is as a guide: they show the direction you're heading, but that doesn't mean that you're obliged to follow. You're in charge. If there is some detour that you follow for a few days, or if some task otherwise takes longer than expected, that's not a problem, that's simply time to revise your plans. The schedule-as guide-is there to help you get where you want as quickly as possible. But the choice to follow the schedule or redirect it is always yours.