I remember an interview with the showrunners that basically said that. There weren't enough tall and skinny people to perform all the roles adequately, not to m

I remember an interview with the showrunners that basically said that. There weren't enough tall and skinny people to perform all the roles adequately, not to mention background extras. And it limited them from casting the actors they really wanted to cast, like Jared Harris as Dawes. They do still deal with the disorientation non-natives deal with in Earth conditions, though. There was an episode that spent a significant amount of its story showing Bobby dealing with being on Earth for the first time and seeing unfiltered sunlight and the extra gravity. There's been a few other instances of it, but it has definitely taken a backseat since that torture scene you mentioned.