Here's [1] the Steam page for split screen games. Currently there are 934. Can't go wrong with Earth Defense Force! And no you don't need a "gaming PC." That term doesn't even make any sense in modern times, because if you have a computer from within the past decade or so, you can run the overwhelming majority of games with no problem. And I mean that literally - for instance GTA V requires an AMD HD 4870 card. That card was released in 2008!
Steam used to sell a device called Steam Link for this very purpose, but now they just release apps for common platforms: https://en.wikipedia.org/wiki/Steam_Link
Microsoft has been consistently failing to support and engage game developers since early in the 360 cycle, then the doublespeak crook Spencer took over, and it got even worse.
This whole shitting on AA was bound to happen with Xbox fanboys saying that “it is good that Microsoft is buying studios to give Sony a taste of their own medicine!”
Except MS is still not giving Xbox gamers a taste of Sony medicine, because Sony gets out there and gives games chances, funds loads of “trial” titles, supports developers and studios, etc.
I don’t like that Sony just does this better, as I am a PC gamer and Sonys PC game is awful.