Why it fails: Task initiation is the real challenge, not task size. Breaking a project into smaller pieces gives you 47 things you can't start instead of one. The issue isn't complexity; your brain hasn't found a way to engage yet.
What works instead: Task bracketing—pair the hard-to-start task with something your brain already wants to do. Body doubling, changing your environment, or the "just for 2 minutes" approach can flip the switch.