Folks using the big TV excuse is not an excuse. I have my PC hooked up to both monitor & 50" TV. It all comes down to gamepads and the other unpleasant things about PC gaming (install, compatibility, pcs always needing to be fixed/taken care of, etc). If these things don't get in the way, I'm able to play on PC. As most of my PC tera bites are wasted on videogames rom images for every emulator out there and whatever PC game interests me that has gamepad support.
I beg to differ on that front; I've played Warcraft 2 on the PS1.
Gamepads are great for beat-em-ups or hack-n-slash but pretty hopeless compared to the accuracy of mouse aiming for TPS/FPS games ... and as soon as you get some kind of complexity in a game such as an RTS or a 4X game, a gamepad just doesn't cut it. That's before you even start looking at the hardware demands of games like Total War.
So I mostly game on the PC but I've also got a PS3 because Gran Turismo, racing char, big screen TV and home theatre system. Though I guess I could probably do away with that, get a small factor PC in the living room and Project Cars on Steam now; I could even get an XBOX controller for it.
Most of the advantages of a console are now gone - you switch it on, you wait for the system update, reboot, you put the game in, wait for that to update, restart the game - wait for it to load... may as well be on the PC at least the games load faster; the days of the "just switch it on and play" console are long dead.
The thing is things don't ever have to be too complex. It ruins the pacing of a game. My fave SRPG is the Shining Force series. Deep SRPG without the BS complexity to bog things down.
And since I'm a gamer from the NES days and still play any game from that era up to the present, there are way, way too many more games I can't ever imagine playing with a keyboard & mouse. And everything works & should work on a gamepad, So why stick with something that's only works with a handful of game instead of something that works with all games?
You should also see the amount of gamepads, arcade sticks & racing wheels I have for all consoles and my PC. Gamepads, and proper ones at that too, are that vital to my gaming enjoyment. So my mind is always on this, and always has.
Sure aiming with a mouse is much easier, but that also is the problem as it also robs a game out of it's fun. Best example I can use is NES Duck Hunt. Playing with a mouse is like playing Duck Hunt with the lightgun up against the TV, while with a gamepad it feels like I'm actually aiming instead of touching the enemy point & click feeling. I can also use a racing example. Playing a racing game with a mouse feels like I'm moving a toy car in the palm of my hand. While with a gamepad or race wheel, it feels more like I'm driving it from the inside. Why do you think folks get Steering Wheels or DualTank Arcade stick for some games instead of just gamepad? To better immerse yourself in. Same deal. There no immersion in mouse and key. Might as well be playing boring browser point and click game.
Now this next point might offend, but's it's honestly how I believe it to be (so not saying it as fact or that it's true). I honestly believe more casuals game with mouse & key, while the more dedicated gamer will invest in better gamepads & keep searching for better ones if playing on PC, hook it up to play on a TV in stead of monitor, part themselves on a comfortable bed/couch/etc., and so on. Why I believe this? Because that's the way I am.