Do you think Notes will make for a good task management application? Does it have to-do lists and commenting?
The ability to tersely create checkboxes by simply typing square brackets [ ] and a few other neat formatting tricks proved to be the path to least resistance for us when planning and organising sprints.
We find we spend less time managing a project management system, less time creating lists of actionable items and more time to actually get stuff done. YMMV with bigger teams, though.