That fits in with two things. Anyone that design hardware knows that specialized hardware is orders of magnitude more power efficient than software. Custom Sil

That fits in with two things. Anyone that design hardware knows that specialized hardware is orders of magnitude more power efficient than software. Custom Silicon -> Programmable Logic --------------> Software. You see that in RF design where tech is developed with software defined radios, then moved to FPGA's/Gate Arrays, and then custom silicon. And the power requirements drop by 95% each step. Also microprocessor manufacturers have always pushed back against specialized coprocessors as much as they can. Apple bringing it all in house allows them to nullify that impediment.