That's precisely why it's looked down upon though- you're often sacrificing higher-level bio, chem, and physics courses for superficial knowledge elsewhere, and thus have a more shallow curriculum overall.
But you're going to skip the higher level bio, chem and physics classes if you major in history or English or music, and those majors have a slghtly higher acceptance rate to med school, and have for at least 40 years, so skipping the extra sciences is not penalized by med schools. Indeed, it seems to be valued. If your point is that "pre-med" majors won't have an in-depth study of
any particular field, I agree, although that may not be such a bad thing.
If it's looked down upon, ( and I don't know that it really is ) it's probably becaues it's lumped in with a "Health Sciences" major, assumed to be a pre-nursing type major with watered down science courses.
The advantage to a student would be if they had several areas of concentration in mind outside the sciences. For example, they wanted to prepare for a career in medicine by taking several business classes, and a lot of higher level programming classes, and some ethics classes, but they didn't want to take the extra classes those fields would require to get a major, just as they don't want to take the extra bio classes needed for a bio major. In the big scheme of things, having to take an extra two or three bio classes to get a bio major isn't a big deal, I suppose, but I was a history major, so I can sympathize with the urge to avoid the extra sciences. Now, if I were doing it over, I would have prepared more for medical school by taking more bio classes, and in the process I would have gotten my bio major, but I wanted to take non-science classes while I could. The outcome is that while I remember pretty much nothing of organic chemistry, I remember lots about history and other humanities, so it worked out well for me in the long run.
Again, I would recommend strongly
against a "pre-med" major, but I appreciate the motivation for offfering it, and for taking it.