I'm not sure you read my post, frankly. I thought I managed to evoke the concept of a huge enclosed space too large to feel claustrophobic. I'm pretty sure I used the phrase "light and airy" to describe the space. What I had in mind, in fact, was pretty much the modern upscale urban environment, except for the lower gravity. Plazas and fountains, bright sunlight two weeks out of four, light and soaring architecture.

My thinking behind it all was that lava tubes eliminate the biggest and most expensive engineering hurdle to establishing habitats in a vacuum. And with that out of the way, you have the means and resources to construct a really livable space. You absolutely would not have to settle for "a lot of bad food, smelly, overcrowded quarters, constant safety drills...like living in a WW1-era submarine" (dude, were you high when you wrote that? I think you went tripping on words and tripped over them.)

You say you'd do a short tour of duty and retire to Earth. I see a place I could retire to. Different universes for different folk.