I think you've hit on an important point. What does PC mean? Obviously not "something in the lineage of the IBM PC," since we're talking about an ARM desktop PC

I think you've hit on an important point. What does PC mean? Obviously not "something in the lineage of the IBM PC," since we're talking about an ARM desktop PC. And we're not talking about off the shelf computers that have ARM chips, because we have the Mac and Chromebooks. I'm guessing it probably means something like - why isn't there the equivalent of the x86 hardware world, but using ARM? Why can't I buy a CPU and motherboard with modern standard interconnects that I can use for a video card, SSD, etc; or maybe get a beige box computer, but it's ARM-based?