I have a theory. I don't believe we are very good at piloting vessels that have truly arbitrary force vectors applied to arbitrary positions on the hull of the vehicle. Normally, even when such a thing tries to exist in the atmosphere, the intense amount of friction of the air (or water) will tend to right the vehicle to a certain orientation. Boats aren't the shape they are just for minimization of hull friction, it also help us "face forward" when we are driving them.
A vehicle in space has no such (or very little) "corrector", and what usually happens when a human tries to pilot such a vehicle is that some minor off-axis inertia confuses the hell out of us and we can't figure out how to correct. IOW, the spaceship start travelling off in weird directions with crazy spins.
Maybe someday, when space flight is a common reality, we'll all be accustomed to it, but for now, we aren't. And I'm guessing people don't want to play a video game where they can't figure out how to pilot the craft, so the creators put some grounding rules to make it more palatable to us.
That's just my theory from having play around with some inertial simulators in the past.
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