"Fans say a planner is about more than schedules and to-do lists—for many, it is a form of self-care and control at a time when the world feels out of hand."
It's similar to the inherent risk that comes with diving into a new television series and watching the entire first season, only to find out it wasn't renewed for a second, only with much higher potential for lost time and mental output.
Things come up. Priorities change. But the danger with apps is that there is no record of this completely valid reason. No record of how often things come up that cause you to move and delete tasks, as well as no record of how often tasks are moved just because you didn't feel like doing them. No record, and no accountability. Tap tap tap.
There's no need to make decisions like that because...there's a "+" button RIGHT THERE!
We all want to feel productive. Time management app developers want you to feel productive as well -- while you're using their app.