Well, to-do lists are invaluable and you can’t be productive without them. If you are still productive though, then this is zero compared to your actual production capability. Also, calendars should be reserved for appointments only. Shifting stuff to later days only means you’re procrastinating them. Do not schedule an item for a certain day unless it is absolutely necessary to be done in that day and time only. If an item can be taken care of at any time or day before or after that point of time you schedule for that item on your calendar, then putting it in that place in your calendar is a waste of your calendar’s potential and it means you’re holding yourself back. Also, it would strain yourself greatly for no necessary or beneficial reason. You are committing yourself to have the energy, interest, motivation, and enthusiasm for that item at that point of time in the future regardless of anything. That is a recipe for extreme stress. It is okay to plan for the future, throw a suggestion into a day in the future every now and then, decide to take care of some matter in a particular day that hasn’t arrived yet. That is a good idea. Planning some of the tasks of some of the future days. But to get entire days in the future all already scheduled with tasks ahead of them before these days even start by a long time or by a few days before you reach those days in the future that are scheduled with tasks or by a very big number of days prior to them or at any day that comes before those days, then you are just restricting and restraining yourself. You are just holding yourself back. You are giving up your free will and on the spot decision option for some kind of certainty of outcome. It is not because you have no idea what might pop-up in the future that would require some kind of modification at its time, but it is because you got everything there is about these days figured out already, predetermined, and decided. You are then only acting out those days. How about the need to figure out what you really really want to do at present. The need to feel free and autonomous. You are totally depriving yourself from that privilege or option by making everything about these future days all figured out and predetermined. It is like walking and receiving what destiny has in store for you instead of you shaping or creating your own future on your own terms. You created it for a few minutes then you went through it like a robot for all the remaining hours and days. That is self or personal dictatorship or slavery. And it is detrimental to your mental health, well-being, quality of life, intelligence, and happiness. This may shut down several centers in your brain, at least some that are involved in assessing and decision making, leading to you not operating while you are fully functioning. You would want to jump instantly to the future where all those predetermined days are over, like time travel in a blink of an eye or in a second, because you can’t bear to be at present or you can’t stand being at that kind of present. On the other hand to-do lists generate an amount of mindfulness that topples or beats the degree or amount of mindfulness that you can get from any kind of meditation there is regardless of how long the meditation practice is or the meditation sessions are. An amount and degree of mindfulness no meditator ever thought or dreamed of reaching from any kind or duration of meditation possible. Too huge inhibition from doing anything else that is not indicated in the calendar is not something that I believe will not have a negative side effect on your brain in the long term. You will be a good soldier, but a horrible leader and manager of yourself. You can do anything, but from where will you get good orders to obey in the first place? From the corrupt dictator or bad government? How alive do you expect yourself to be? And how long until you start to complain from convulsing anhedonia? You shouldn’t take generating or coming up with good ideas for granted. They start to emerge in a whole new different way the more you start following your impulses as they are generated. Regardless of predetermined plans, brilliant ideas feel they are welcome to be poured into your daily plates as long as you do not shut them down, delay them, cancel them, inhibit them, repress them, suppress them, or sublimate them frequently or on a regular basis. This is key to your creativity, which includes creative problem solving. This might decrease your creativity during those days, and creativity does not just require spontaneity but freedom to be able to kick in.