Don Durito
Hero
You curate the setting so the game can focus around a particular theme and not be a railroad.I really wouldn't conflate enjoying curated settings with enjoying railroads. Now one may of course like both, but they're completely separate things. I like playing in curated worlds where the GM has put a lot of thought in things and have an unique vision. I want to explore such worlds, and that it is a product of someone else's mind makes it surprising and exiting. But I want to do the sightseeing at my own pace and not on rails.
If what I want to do is run a Dwarf focused game set in the last great dwarven city as enemies approach on all sides what I don't do is start the game with a random collection of characters in a random village and then find some hook to railroad them along to the Dwarf city.
This way the players also know up front what they're getting into and can assent to it or not.