When you schedule things, you are forced to deal with the fact that there are only so many hours in a week. You’re forced to make choices rather than add something to a never ending to-do list that only becomes a source of anxiety. And you can’t just schedule important work and creative stuff. You need to schedule time for rest and recovery and mundane things like email.
To-Do Lists Are Not the Answer to Getting Things Done
Shane Parrish

I have always been a huge proponent of Calendar and it’s utility, and now I know exactly why I need that structure ✌