Been a long time since I saw the "you need a monitor" argument, easy to forget that consoles actually require screens too and these are quite a bit more costly in most cases. Yes; you use your TV for other purposes as well, but that argument also easily covers a PC as a platform.
I'm also amused that OP was startled when he realized that you need an OS to run any platform! 
Personally; I find the PC to be a far superior gaming platform, regardless of cost. I chose to spend a ridiculous amount on my current gaming rig but the gaming in and on itself is actually quite a bit cheaper than on consoles. Plus there is a myriad of accessories and peripherals for every need and everything can be customized, free online, connects with pretty much everything and the backlog/gaming library is quite simply unbeatable; you have access to literally every game ever released (or very close, at least).
A 300-400$ PC is not a gaming PC, that's a cheap common desktop at best, I paid that amount for my laptop and that has piss poor specs and I use it for writing, media and browsing. The cheapest gaming PC I ever bought cost about 1000$.
Ramp it up to 700-800$ and you're talking a rig that can best One and PS4 on performance and the excess cost of purchasing hardware is easily covered by free online and much cheaper games (don't even get me started on Nintendo in this regards, their software pricing is ridiculous, especially on older titles) with the added bonus of flexibility and a lot more functionality and compatibility.
The whole complexity issue is also largely a thing of the past, doubly so with digital purchases, and the patch craze has hit the consoles just as hard.
If someone is able to operate their smartphone and buy and install apps and use them; they are more than smart enough to purchase, auto-install and start and play a PC game, people who aren't tech savvy enough for this are largely the ones who have trouble finding the right buttons on a simple gamepad as well.
PC gaming is certainly not for everyone, so naming a "winner" in this perpetual debate is impossible; it comes down to preferences in the end.







