I've heard similar things as well, but also learn what your research interests and end game are. For my interests (which is more O oriented), no one I applied to would care if I had HR interning experience or that I have a business minor(I have one, and was told before they'd rather see a stats minor, but my undergrad university didn't offer one), but that might matter for people whose interests are more I. And to be honest I feel like I wasted my time with my business minor because there was only 1-2 out of the 6 classes I had to take that were useful, and I wasn't allowed to take any other business classes that might have been. But all those things might be useful if you only want a masters and do consulting.