Just sharing my flow for those looking to build note taking apps:

I use whatsapp for note taking. It solves a similar problem for notes as drop box did for files.

My notes are usually pointers. I don't track tasks in there. Tasks go into a separate app. I use apple mac reminders for task tracking. The way I use it is - I ask siri to set a reminder with task desc.

My tasks are reminders that I extend if they are not done by the expected time.