ZooBis
First time out of the vault

Are you referring to NCR Adobe architecture? If so, it was a missed opportunity to utilize them in New Vegas to make NCR territories more distinct and interesting, thereby strengthening the theme of a post post-apocalyptic world. But I suspect it wasn't there due to time constraints. The same goes for the show where there are ruined skyscrapers and some generic architecture instead of adobe, like in the classics.the brotherhood of steel were bunch of tribals in fallout 1
Edit #1: they should have explored the tribalism theme in the brotherhood, it existed since fallout 1 but they were turned into generic technologist, i feel the same toward shady sands/the ncr their semi Indian/Egyptian culture made them unique, now? they are just westerns culture Americans
Edit #2: the generational ship is also biblical plot for the rapture like fallout 1 and arcanum stories