A calendar view
I like/love todoist - in theory. I paid for the premium. The biggest challenge is that it is time-consuming to move a bunch of tasks forward on the calendar - day to day or a couple weeks.
I use Google Calendar and use their tasks but there is no hierarchy or project view - which is limiting. However, I can view several weeks of a calendar and drag tasks between dates. THIS IS HUGELY CONVENIENT.
Going to each tasks line and changing the date in todoist is awful.
I am less looking for a Google Calendar integration unless it is 2 way and immediate. But have you thought about having a calendar view where I can drag tasks from date to date similar to Google Calendar's tasks?