The thing that bugs me about the blackout/redout mechanic, besides the fact that with all the maneuvering your screen is just constantly fading in and out, is that it doesn't make sense. Real people can only take up to about 8 or 9 g's before passing out - and these are top notch pilots wearing G suits.
The maneuvers you're performing in Star Citizen are constantly at that range or higher, which, aside from explaining why the screen is constantly fuzzing out, also means that the player would be probably crushed from the inertia changes. But it bothers me that they nod to one point of the realism but not the other.
As for limited yaw in E:D, that's actually pretty easy to explain...very few of the ships have lateral thrusters. Not sure if you noticed it but most of the thruster locations are on the top and bottom of the ships, with very little on the sides, so...it actually makes sense that the yaw is limited.
I don't know if that's the actual reason for it (in the game developer's minds), but just from how the ships look, that's my explanation for it.