According to Carl Pullein, all you need for #productivity are a calendar, a task manager, and a notes app. A task manager, he says, must have 3 things: folders, lists, and the ability to put tasks in front of you at a pre-determined time.
So in theory you can use #Obsidian as a task manager, but it’s 2 out of 3 unless you use plugins. I spent years trying to bend Obsidian to my will, but it never fully clicked for tasks. Reminders + paper = my current sweet spot.