This is actually one of the main reasons I am very close to switching to FATE Core. I don't need endless pages of lore that I'm never actually going to use. FATE's World of Adventure series is perfect for my needs: a dozen or so pages on the world and the genre's tropes, a dozen or so pages on any mechanical changes or special rules for the setting, and the rest for an adventure which gives hooks into extending the story into other spinoff adventures if the group really takes to the setting.
Now, this isn't the only reason I'm seriously considering the switch, as the two systems are vastly different and I think FATE is closer to what I'm looking for in an RPG overall. And in terms of adventures Genesys may get there eventually, as I gather they did over time with the Star Wars series. But unfortunately the opacity and speed (or lack thereof) of what's coming in Genesys vs. what FATE already has and is doing is pushing me away from Genesys.