Unless your PC is seriously weak sauce you could simply slap a GPU in it and play games just fine,
I run Linux on my PC, I would rather not run Windows. I also had a PS3, PS2 and PSone before it, though I don't own any any Sony TV/Stereo equipment. I also prefer analog movement to WASD. Playing games on that PS4 is "Easy Button Easy", no muss, no fuss. "It Just Works"
hell I got customers with Phenom II X3s and X4s that have no trouble playing the latest games. Today you can buy GPUs in the $180 range that curbstomp both the XB1 and PS4 in the purty dept,
I have a Phenom X4 in it, and a GT640, but to curbstomp that PS4 would require a GT970 or greater (which is more than $180). All I know is that War Thunder runs better on the PS4 than it does on the PC (I do have the Linux version installed), the controls are a non-issue since War Thunder PS4 supports the same control methods the PC version does.
I don't want to have to pay $180 (or more)...just for a video card. I want to just buy a box and not worry about upgrades for years and know that most every game that says PS4 on the label will run fairly well (with a few notable exceptions from some exceptionally lazy developers).
I also think we shouldn't be throwing new hardware at games willy nilly. "Fixed" hardware encourages developers to at least try to do proper optimization rather than being lazy numbskulls.
I'm a console gamer at heart, I really don't think highly of PC gamers at all. When I'm being uncharitable I sometimes say things like "PC gamers are a bunch of overly entitled pirates who spend hundreds of dollars/euros on a new video card and then complain about high game prices so they go pirate everything or play a single map in a single game for 10 years. Perhaps if they spent less money on hardware they'd have more money for games"
I have a finite amount of fun money, every dollar I spend on hardware is one less I can spend on an actual game.