@apos I think you're understating the impact of different societies on everyday RP.
For example - when I played on 100 there was this one scene where some of the Arkers were visiting the city and it's like... wait, how does the economy work? Are there restaurants or is it a like a tribal common meal? Can I just go and say "These are my guests, give them food" or do I pay for it or what? Is it some grand faux-pas to bring outsiders to the marketplace? IS there even a marketplace if there's no free economy?
This crap is not easy, and yet it's vital if you want to do scenes beyond: "okay we get food somewhere somehow... handwave handwave handwave"
The same can be said for leisure time, sports, popular media, etc. To say nothing of the complexities if you introduce aliens.
In a fantasy setting everyone pretty much has a shorthand of "DND economy / feudal politics" and you're off to the races. People don't travel as much and it's not like they have the internet, so ignorance is easy to handwave ICly without your character looking like an uneducated bumpkin.
This kind of stuff is way more impactful than someone demanding "tell me all about how a phaser works".