The problem
Everything about your day lives somewhere else.
Work meetings in Google Calendar. The dentist in Apple's. A task list in a third app that pings you at nine at night about the thing you didn't finish. And how you're actually doing, the five hours of sleep and the headache since lunch, sits in the Health app, where nothing else ever looks.
So you plan Tuesday as if you're the same person every Tuesday. You aren't. Nobody is. The plan breaks by two o'clock, and the app blames you for it.