Hi all, just a quick note to let you know it’s currently possible to see subtasks in List view: You can now see and action subtasks directly from your Project task list!.
In regards to Calendar view, I recommend you to vote for this feature here: Subtasks in Calendar view - #8 by Bastien_Siebman We will also make sure to post any updates in the main feedback thread 
Thanks for all the feedback you have shared in this thread too!
