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Desktop, laptop, and even tablet class APUs could never be used in phones due to power and thermal constraints. The Snapdragon 835 (which started as ATI Xilleon way back when, bet they're kicking themselves still about that), for example, uses under 5w of power, whereas the processor alone on an Intel Core M starts at 5w, and that doesn't include graphics, audio processor, and everything else integrated into the chip.
Intel’s Cannon Lake is a bigger chip and its higher TDP makes it different from the Snapdragon 835 mobile SoC. Intel wants a much higher TDP. It starts with 5W for the Core M and goes all the way to 130 W for the high end desktop or server. A mobile SoC such as Snapdragon 835 stays in the 2.5 to 5W TDP range to fit phones or tablets.