There is a huge difference to being tethered to a fixed device (like a desktop computer) and having a wire running to your own body. Having a wire running to your own body, you can still do all of the spinning/ducking/jumping/whatever that all sorts of games require without worrying about getting tangled.

Running the wire down the inside of my shirt and to my hip is completely negligible. Having a wire plugged in to a stationary device / the wall is absolutely non-negligible.