It's really not hard at all. Most gaming laptops are 1080p and most TVs are 1080p too.
Most laptops are not gaming laptops, though, and there is not anywhere ubiquity in native laptop resolution displays. You are also completely ignoring the issue of pc games (sadly) not always supporting a wide variety of display resolutions. Even triple-A games suffer from this.
There really isn't any need to fiddle with graphics setting on your games since the output is the same resolution.
See above. This is often the case, for sure, but it isn't always the case. Those circumstances where it isn't the case become a real pain in the ass.
It's not just about fiddling with graphics; specific games sometimes do not support your native resolution, or if they do, optimization is shoddy and does not play well with BPM. The worst example that comes to mind was Dark Souls 1 pre-fan patches. Streaming from my laptop would often randomly switch resolutions and then get stuck in a feedback loop of my television trying to auto-detect the proper resolution. Many deaths were had.
As long as you project to the TV and not extend or duplicate, games should run exactly the same as they would regularly on the laptop.
Again, a big difference between this being the case a majority of time vs. this being the case all the time.
All you have to do is plug it in, do one hotkey to project the display, click play on the steam game, and sit back on your couch with a controller.
And what happens when the battery dies? At this point it's obvious you never do this.
It's also obvious you've never touched Big Picture Mode, if you think it always works flawlessly.
You're also omitting the dual purpose of the laptop. Along with being able to game on it, the laptop is also a computer. Easily stream movies, browse the internet, watch torrented content (if that's your thing), etc.
No I'm not? I'm not comparing a console's uses to a laptop's uses. That's like comparing a car to a closet. This discussion is purely about the practicality of pc streaming to television.