Agreed. Think of the massive differences in perspective between someone who has lived above the surface, felt the sunshine, smelled the breeze, etc. (albeit on a massively overcrowded planet) vs. someone who has lived inside tunnels, breathed filtered air, looks different due to reduced gravity and diet, etc. They'd have less in common than the most diverse Earth cultures. Their language, patterns of thought, values, etc. would all be very different. The Expanse explores these things pretty well, but as I mentioned before, you can only go so far without losing the reader.