Why does the Xbox director Don Mattrick leave Microsoft?

Microsoft has been the dominant software industry, but because of years of lack of innovation, it has lost many opportunities. As the battlefield of mobile field unfolds, Microsoft has to accelerate the pace of innovation. Microsoft is struggling to hold and regain its position from major software updates such as Windows Phone, Windows 8, to the production of Surface tablets on its own. Meanwhile, in home Entertainment, Microsoft recently released its Xbox one, an ultimate device that promises to dominate people's living rooms. However, if you follow Microsoft's latest moves, you will find some strange rhythms. For example, in the upcoming Windows 8.1, Microsoft turned the "Start" button back on, and in the new Xbox one policy, Microsoft had a series of new DRM policies and validation mechanisms in the press conference, but it completely reneged on a week later. These little things seem to show that Microsoft is a bit unable to find the rhythm of the feeling, on the one hand want to open up the situation through radical innovation, on the other hand worried about users fled, have to be cautious, ready to adjust. Is this a faster pace of innovation or a lack of planning and perseverance? If the above description is trivial, Microsoft's high-level changes are indeed a bit strange. Steven Sinofsky, the company's heavyweight and director of the Windows Department, left the company to become a professor shortly after Windows 8/surface was released. The incident caused quite a stir. Now, another heavyweight of the company, Don Mattrick, has suddenly left the company, and the timing is exceptional. Don Mattrick, head of the Xbox project, spoke at the Xbox One conference, but only 3 weeks after he suddenly went to the ailing gaming company, Zynga. According to the Mashable website, Don Mattrick's departure also shocked Microsoft. Microsoft CEO Steve Ballmer confirmed the news in a memo and said his management staff would report to him directly after Don Mattick left, focusing on the Xbox one holiday sale. The company needs to find a new supervisor. This is clearly not a planned act. What's the reason Don Mattrick left? The Mashable website mentions Microsoft's change of Xbox one policy. After Microsoft announced the new game, Sony announced that PlayStation 4 would not have the same requirements. It was a deliberate attack on Microsoft, and the timing was very accurate, forcing Microsoft to adjust its policies quickly. Perhaps Don Mattrick's insistence on policy made him no longer popular. The company has fired Microsoft Studio Creative director Adam Orth because he said on Twitter that those who can't accept forever onlineHouseholds should "learn to adapt". Don Mattrick has expressed the same position. Another speculation is that he will be restructuring Microsoft, and Don Mattrick to leave. But many people say that Mattrick will not be affected. In any case, the departure of Don Mattrick is not good for Microsoft. The company is in the midst of a critical moment in the Xbox one release and is under attack from Sony. What's the reason Don Mattrick doing this? Does it reflect the company's rapid progress while also creating some problems?