You make a detailed schedule. Color-coded, time-blocked, organized. Then one thing shifts - a late start, an unexpected message, a meeting that ran long - and the whole plan collapses.
This isn't poor discipline. It's a structural flaw in how time-based planning works.
The Fragility Problem
Fixed timetables assume the day will run as planned. They don't. Research on planning fallacy (Kahneman & Tversky, 1979) shows that people systematically underestimate how long tasks take and how many disruptions will occur. When a time-bound plan breaks - and it always does - there's no recovery path. You're now "behind," which creates guilt, which creates avoidance.
The cascade failure is built into the format.