some people simply just don't get computers. it's really that simple. following tutorials is easy to setup a pc, but there's just a lot more things that can go wrong for various reasons with a pc.
for instance, my usb wifi adapter doesn't have a working driver for windows 10. i can't even go online via wifi. i know other methods to try and fix this, basically searching google for driver solutions, but some people wouldn't know wtf to do.
what happens when a new game comes out and the drivers aren't right and the game runs like crap and you need to install a beta driver to resolve it? how does a non computer savy person fix this? to them, that's a hassle... they just wanted to power up and play a game but can't and might get frustrated from it.
we're familiar with pc's and for most people, there aren't many issues that come up...but with all the random configs out there, there's just so many more chances for things to go wrong for the most random reason. a pc just isn't as convenient as a console for the general population who don't know crap about pc's