Most PC games nowadays have excellent controller support and scalable UIs so you can play PC games on a couch. And with Steam Big Picture mode (Buggy though it may be) you can even control Steam with a gamepad. Theres also the option of Steam In-Home streaming which allows you to stream games from your gaming PC to any other machine in the house which works wonders in my experience.
My PC resides in the living room. I don't particularly like action games, especially shooters and competitive games. The games that do interest me all lack proper controller support and scalable interfaces. Examples? Diablo 3, Sims 4, Divinity Original Sin, Pillars of Eternity, and Shadowrun Returns, off the top of my head. Even with Big Picture Mode, things like achievement pop-ups and the browser in Steam are too small to be visible at 1080p while playing from the couch. Playing games with a keyboard and mouse on the coffee table is uncomfortable, and controller mapping is usually terrible at best.
On top of that, I have a monitor on the coffee table that I use for doing work with. It boggles my mind how terrible multiple-monitor setups are to manage. I would prefer being able to select the display and audio device to use for each program, but it is not possible. Instead, I had to make my TV the primary display in order for games to launch on it, which sucks when I'm not gaming, but watching TV, and dialog boxes open on the display I'm not using; or having to manually switch back and forth between headphones and HDMI audio (and launching a game only to find out I forgot to switch, having to exit, change audio, then re-launch).
I've been using PCs longer than a lot of people have been alive around here. My first PC was a 286/16MHz, 640KB RAM, 256KB video, and an 80MB partitioned hard drive in 1988. I remember the terrible Street Fighter 2 port, the vast differences in audio from different sound cards, the mushy Gravis gamepads. Console gaming has always been better to me. PC gaming may be good enough for many people, but based on how I play and the types of games I like, it still has a long way to go.