GTD orthodoxy frowns at Todo lists into calendars. It proclaims that the calendar should be reserved for reminders about actions or events that have timelines. The most frequent argument against Todo lists is that one must rewrite what has not been done the next day, ad nauseam. This argument cuts no ice.
First, electronic calendars can make events reappear daily. It is quite easy to create an event acting like a Todo list, that is repeated every day until the end of time. One can even be sent a daily email reminding it, so one can cross what has been done et add some new stuff along the way.
Second, rewriting Very Next Actions is not a chore. It is a simple way to memorize what needs to be done. The mind commits daily to the very next actions. Actions are not next actions unless they are Very Next Actions ; one can't do that many Very Next Actions.
Third, communication is informational redundancy. That means that most of the times, less is less, not more, and more is more, not less. Processing notes, for example, can't be done without some editing. It seems easier to proceed to mind sweeps in one go, then to organize the actions and the ideas later.
One of the best argument for GTD is the maybe list. A Maybe list is just a list of half baked ideas without any urgency. A Maybe list empties the mind while taking a hold of these ideas. To maintain a Maybe list, one has to write things at least twice.
If one uses its calendar as a personal assistant, one gains enought time to write everything twice.
