https://www.cnet.com/news/apple-will-no-longer-tell-you-how-many-iphones-ipads-and-macs-it-sells/

The change comes after Apple posted fiscal fourth-quarter results in which iPhone revenue soared despite unit sales that missed Wall Street's expectations. The omission of data will make it harder to get a sense of how well Apple is performing. iPhone unit sales are a critical metric that investors and company observers use to weigh its performance. 

Apple benefits from the shift because it's able to generate more revenue on its products by raising its prices. On Tuesday, it unveiled new iPads and Macs that all saw a bump in their price tag.