Apples and oranges. Intel's mobile Skylake processors don't support more than 16GB of low-power RAM; Apple didn't have anything to do with that limitation.
I up voted your response as it's correct, but for anyone who doesn't want to believe, here's a fully referenced post I made a while back with specific references in the Intel documentation:
Now I know why both the new surface book and the mbook pro have such paltry ram configurations. Sad times when intel itself seems to be falling behind.
Intel's mobile processors like the ones in the Macbook Pro support up to 64 megs of ram. Their ultra low power cpus only support 16 gigs, but the line in question goes up to 64, even with ddr3l ram.
This is a boxy desktop, not a mobile machine.