The PS4 isn't a PC at all though. It's missing a bunch of core components, it has different memory maps and instead of a traditional motherboard chipset, it has a separate ARM controller that does crazy stuff.
Checkout the Fail0ver video on porting Linux to the PS4. It's really interesting.
I remember watching that talk and thinking it was interesting but also that the guy was a little harsh on Sony. Sure the engineers at Sony may have done some weird choices in some places, but I think they likely had their reasons for doing things the way that they did. And at the end of the day, Sony delivered a console that works well for its intended purpose.
Checkout the Fail0ver video on porting Linux to the PS4. It's really interesting.