My Day - inconsistent and confusing

The My Day feature is one "potentially" one of the best hidden gems for productivity.
I add tasks to My Day in To Do and then drag them onto my calendar in Outlook. But the integration with Planner is awful!

My Day in Planner shows tasks from To Do + Planner

🚨 But I can't drag to order them by priority 

My Day in To Do for Web shows tasks from To Do + tasks in Planner I've added whilst in To Do

🚨 But it doesn't display tasks I have added to My Day in Planner

My Day in Outlook only shows tasks only from To Do

🚨 But not tasks I've added to My Day from Planner

It'd be amazing if this worked as you'd expect. Please let me know how I can provide this detailed feedback beyond the feedback portal.