I'm pretty sure people would be extremely pissed off if every time they struck a rock while riding their Sparrow on The Moon they were catapulted off into space and floated away into the blackness, yeah that would be great!
We are revived dead people who have supernatural abilities which we use to kill several different species of alien beings that have invaded our solar system, I'm pretty sure accurate gravity is the least of our worries in terms of realism.
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Any time I notice an element that contradicts the fundamental laws of physics in this game, I just write it off as "space magic".