By "ad-hoc todos item" I mean an ordinary todo item that consists of an arbitrary label and a checkbox. Checklist apps have more or less formalized themselves o

By "ad-hoc todos item" I mean an ordinary todo item that consists of an arbitrary label and a checkbox. Checklist apps have more or less formalized themselves out of supporting the simplest todo use-case (you have to define a list, add an item to it, and then instantiate the list before you can actually mark the item as "done", and you generally have to edit the master copy of the list rather than the instantiated one). All of which is great for making sure you do something the same way without skipping steps every time, but prevents you from completing both checklists and less structured todos in the same context.