I attended a talk from Digger webcomic author and artist Ursula Vernon, and she seemed to have a different approach. If I remember right, she said that instead of planning the whole thing in advance and placing specific Chekhov’s Guns as needed, she put in a lot of small detailed world building everywhere, allowing her to choose from whatever seemed appropriate at the time.

Chekhov‘s Guns are important for short stories (which is what Chekhov was famous for), but short stories are not the only type of fiction and they don’t fit everywhere.