Of course it is about costs, which was driven by the fact that the technology for on sensor phase detect autofocus got good enough that the separate phase detec

Of course it is about costs, which was driven by the fact that the technology for on sensor phase detect autofocus got good enough that the separate phase detect array was no longer required to achieve high performance cameras (the DSLRs days were numbered when the Sony A6000 was released), and probably today would result in worse performance.