I agree that it’s overused. But the stories who have the accidental trip look actually accidental, make it natural enough to not look corny. Personally I like the way the author made her trip: it showed she was clearly focused on something actually interesting—Isidore not having gloves—and that she was a few steps into the stairs before actually tripping. It’s unique to have these details

Has there ever been an FL who didn't trip on nothing? I don't know why but the trope annoys me every time I see it.