“Real world” stories don’t need to dwell on it much because you can just use history and real life - if you base a story in 50s Detroit it’s going to be much different than 2020s Detroit. And if you mess it up and claim 2020s Detroit is a bustling hub of automobile manufacturing it’s going to feel off.
But fiction, especially fantasy and sci-fi, needs a lot of these details to be at least thought about. Then the references and glimpses will feel correct and real.