Years ago, I interviewed a level designer who had originally trained as an architect, which these days is not an uncommon career trajectory. I asked him about the benefits his skillset brought to 3D level design. He talked about how it helped with approaching scale and structural integrity and creating a rational space.
Then I asked him about what the personal benefits of creating virtual building were. "If you design a building in a game and it falls down," came his simple response, "it cannot kill anyone, and you don't go to prison."
It was a pragmatic reply from a pragmatic person. But underneath it is another meaning - you can build anything you want. In virtual 3D space, the laws of physics don't apply unless you tell them to, and that means you can design any structure that you like.