Interviewers will ask why you don't already have the Staff title. This question tests self-awareness and can sink your candidacy if handled poorly.
Valid answers exist. Your company doesn't have a Staff track. You joined recently and haven't gone through a promotion cycle. The bar is exceptionally high internally. Political factors blocked promotion despite scope. Pick the true reason and own it without bitterness. Then redirect: "That's why I'm interviewing externally. Let me show you the Staff-level work I've been doing." Turn the question into an opportunity to demonstrate scope with concrete examples.