As Thomas Mueller commented, I am a bit concern with your answer. Do you mean that Microsoft feels it is better for the individual that is part of a work team to have 2 separate tools to manage their daily to dos?
I love working with Wunderlist and I also appreciate the Office 365 infrastructure with 365 groups, Teams, Planner. I like how slowly things are coming together. But I hate having my tasks on separate services.
I strongly recommend the you guys revisit the road map on this topic.
But I do want to recognize the constant effort by the different Microsoft teams to bring Office 365 tighter and more integrated.
Keep up the great work.