I think many of the listed tasks aren't simple because they involve many subtasks, and a bipolar person cannot breeze through them on autopilot. If you think through what is involved in taking a shower or paying bills, you will see many steps - e.g. you need to gather everything that is required to carry out the activity. And that just isn't simple.

Going shopping includes making decisions, and when you are severely depressed, you are not up to it. When I had my worst depression, I could not order a cell phone for months. I could not follow a simple instruction.