✔️ ✅ ⭐️ Sub-projects suck — why 19 years of a flat structure made my app better

You open a new productivity app and you start getting organized with a hierarchy. Projects. Sub-projects. Tasks. Sub-tasks. This feels serious. This feels professional. You feel in control. Yet when you open my to-do app, Nozbe, you won’t find sub-projects or sub-tasks. For the last 19 years I’ve been refusing to give my customers these features because I’ve felt this added complexity and hierarchy go against the efficiency of getting things done. Turns out my hunch was correct and there’s some actual research behind this. The feature everybody asks for Why hierarchy feels so good… but works badly! 40 years of research: deeper means slower and more wrong 1. People act fastest with shallow structures. 2. People double the error rate with complex structures. 3. People perceive hierarchical structures… as more complicated! How people actually organize when nobody’s watching Your head holds about four (4) things — not four levels! Scrolling is like falling… easier than climbing! But wait…