I'm actually quite surprised Apple didn't go with Ryzen/Threadripper already in their Mac Pros, considering what a huge multi-thousand dollar margins that would have offered them (at least if they went with the same absurd prices as the Xeon Mac Pros). And they could've still claimed a significant boost for their Mac Pro performance compared to the old Intel chip in the last generation.
They could've also replaced all of their dual-core laptops with quad-core Ryzen APUs for about 2-2.5x increase in both CPU multi-thread performance and GPU performance. And I don't think it would've cost them more, or not significantly more at least. AMD seems to price their cores at 50-60% of Intel's cores.