I don't think we are at all at a disadvantage. It isn't as if OMM is completely unrelated to the rest of medicine. If done right, it helps cement the other concepts.
At our school, we go through each of the body systems, talking about osteopathic implications, and that serves as an additional review of those systems. We get into detail with the anatomy of each part of the body in turn, and again, that serves as an additional review of that board relevant information.
DOs need to stop with this idea that we are playing second fiddle. We get all the didactics that the MDs get, plus a little more. And that little more doesn't detract from anything... it is just extra practice.
Yes, it takes up some time. But all the med students I know at my DO school still manage to have a little free time. We still find opportunities to run in marathons, or watch Netflix, or have talent shows and awesome costume parties. I'm not saying that any of those things need to be trimmed out to make time to study... I am saying that even with all the extra material that we do have to study, we still have time to do those things, and we still manage to rock our boards.
I'm not saying we are better than MDs. I'm saying that we need to be proud of the little bit extra we get and stop treating it like it is such an incredible burden to be asked to learn something that we may or may not want to use later in practice. The act of learning it helps us engage more fully with all the rest of the curriculum, and that makes everything stick in memory better.