content: TickTick provides my ideal structure highest level is a list then a task then the option to have checkboxes for tasks. It allows you to share a list so that every task made within a list is shared as well  no need to share every newly created item. Reminders can be persistent perfect for someone like me who would otherwise swipe away the reminder before completing the task. Textdate parsing makes it easy to set dates and times. Customer service is always quick to reply.