I think a truth I could benefit from internalizing better is that the reason procrastination is bad isn't just cos of "practical" stuff such as "if you leave the task too late you might not have enough time to finish it" or whatever (although, that too), it's that having an uncompleted task in the queue just unavoidably takes a non-trivial mental toll, you have to hold that task in your medium-term memory, your thinking about the near future always has to account for the fact that you need to slot this task in somewhere... even if this kind of stuff is being processed mostly unconsciously it's still mental resources being devoted to this thing, mental resources that could be doing something else! Even if it makes literally no practical difference what time of day the thing gets done, the day where you do it at 9am is just automatically much better than the day where you do it at 9pm. It's very seductive to put something off because "it doesn't really matter when this gets done" but I think that's almost always a fake idea.
