I've been part of interviews on company / hiring side for a decade now,and had hiring authority and lead interviews for half that time. Less than 10% of people ask any meaningful questions,and I'm not sure anybody ever came as prepared as the author suggests (while some interviews have indubitably been practice / uninvested ones, that's a given percentage only). At least for last 3-r years I've been actively inviting questions at multiple opportunities. At this point, asking good question at an interview is a meaningful data point to me because even will all of this advice, few people do it :-/