So what is it? 6%? 10%? I think
@LizzyM's school is like Stanford. The point isn't that it isn't nice to have. It's that you obviously don't need it if 95% of their students don't have it (I'm not talking about posters, etc., but major pubs that med schools actually care about). Same as being the biggest butt kisser the PI ever had. Nice to be recognized as such, but isn't really going to move the needle in med school admissions.
It's really not worth arguing about. You can either accept the point or not. It's of lowest importance according to a survey, and the vast majority of matriculants, at all tiers of schools, don't have it. Does it hurt? Of course not? Does it make a difference? Apparently not.
It's just something people with a ton of research sometimes end up having. It's not going to push someone who has other gaps in their application over the top, and the absence of a publication does not stop around 95% of matriculants from attending all of these these schools, including a LOT of people with decent research who just end up not being published. Research heavy schools care about the research, not the publication. What else is there to say?