Actually real drivers do play this game... I'm one of them.
If you can't stand driving safe than you have no place behind the wheel of a rig, plain and simple. That's why speed limits are enforced. This isn't Grand Theft Auto or Grand Turismo. It's not a racing game. It's a trucking simulator. That's why it has "simulator" in it's name.
The "real drivers" you speak of are the ones who come here to enjoy the simulation of a driving environment, not to see how fast their truck can go down the highway. We want to properly back our trailers, not drive through everything just because it's a collision-free zone. We drive 50 in a 50 zone, not 90. We use our signals religiously, and make proper lane choises, because we want to.
For me a 90kph limit was completely acceptable, and removing it has already caused a mess of GTA idiots on the freeway who need to have their licenses revoked.