I think the discussion can be reduced to kernel compatibility, as everything else is build on top of it.
From everything I've read an watch on YouTube, always on new hardware could be some problems that are solved days after release, drivers mostly; Intel have long time collaborating to the kernel, and I think most of Intel's released cpu work smoothly under linux, AMD's cpus works as good as the hardware can run like intel ones, it has collaborated to the kernel as well though.
On the other side, and I'm getting a little sideways on the discussion, GPU wise is other story, AMD GPUs working good, INTEL don't have one as far as I know and NVIDIA the experience with drivers isn't good until recently but only for new hardware, from 30 series if I remember correctly, and no RT at the moment for linux. Kronos is working on it for vulkan and mesa, there is progress thoug.