Your approach is N=1 though. I prefer to do all of the prescribed workouts, at my leisure, rather than missing any. Some of us don’t have specific races or events, just a desire to improve.
It’s not N=1 though, no more so than your approach is. There are many people who prefer to have a structured training plan to follow, while allowing for manipulation of that plan to fit around their schedule. The calendar allows exactly this.
You say you have a desire to improve, and suggest that the best way to do this is to follow the order of a training plan with indeterminate amounts of time between each workout. It could be argued (and I would) that this is not the best way to go about it. If you can’t commit to a schedule then that’s understandable (although consistency is one of the biggest factors for seeing improvement), but you would probably be better served by picking your workouts yourself rather than just following the order of a training block. There’s no point, for example, following the workouts of a rest week in order if it’s going to take you multiple weeks to complete them.