In this case of making a small one-off tweak with long-term benefits, if the expected return is only moderate, i.e. Should, then it’s always less important than Musts, so you should never do it—until & unless one day you run out of Musts. It may seem paradoxical that there are some things you Should do but it’s optimal never to do them, but that just shows that you always have (even) more important things to do.
However there’s another kind of case which I call the Gym Paradox: it’s never important to go to the gym today because you only miss out on 1 day of exercise, i.e. it’s only a Could so should almost always be procrastinated; but it is important that you go to the gym (i.e. get exercise) sometimes, or you will become unhealthy. I haven’t thought hard about this one and how to resolve it.
In this case of making a small one-off tweak with long-term benefits, if the expected return is only moderate, i.e. Should, then it’s always less important than Musts, so you should never do it—until & unless one day you run out of Musts. It may seem paradoxical that there are some things you Should do but it’s optimal never to do them, but that just shows that you always have (even) more important things to do.
However there’s another kind of case which I call the Gym Paradox: it’s never important to go to the gym today because you only miss out on 1 day of exercise, i.e. it’s only a Could so should almost always be procrastinated; but it is important that you go to the gym (i.e. get exercise) sometimes, or you will become unhealthy. I haven’t thought hard about this one and how to resolve it.