I've come to realize the same thing: it's not all bad and at least makes sense in some regard.

If you think of your will power as a limited resource for example, with blocking out distractions an actively depleting activity (not sure what the latest results on that are, afaik it's a generally valid model that sometimes doesn't hold up), it makes sense to wait with starting your work until the point where distractions simply aren't a viable option anymore. Basically, you conserve energy by making it easier for yourself to stay on task, by raising the 'importance gradient' until 'action selection' becomes effortless.