Arrogance without humility is a recipe for high-concept irrelevance; humility without arrogance guarantees unending mediocrity. Figuring out how to be arrogant and humble at once, figuring out when to watch users and when to ignore them for this particular problem, for these users, today, is the problem of the designer.
As someone who has alternately been accused of being impossibly arrogant and amazingly humble all throughout my adult life, I take this as some sort of strange vindication—apparently I'm doing something right. . . .