This reassignment and movement of people to the iPhone/iPad side has been happening for a long time. That's why I referred to the organizational structure, because the company is not equipped to handle so many things quite well (which has its advantages and disadvantages). One write up about this topic, which I share somewhat often is on Stratechery. [1]. That's worth a read.

[1]: https://stratechery.com/2016/apples-organizational-crossroad...