I mean you certainly want the majority of your experiences to be MD or DO related, but shadowing PAs, NPs, Nurses whatever is a great experience to have. It shows you have shadowed, understood, and compared the professions. One of the things I liked about medicine besides being the boss(I'm a smartass by nature), is being a know-it-all. Quite literally, it was the fact that a) you had to answer to somebody, and b) you didn't know enough. I didn't like the idea of following protocol a lot, I liked to think, I liked to evaluate, while I am not going to lie, some of medicine is algorithmic, a good portion is not. The advent of NPs and PAs into medicine, while it may be bad for PCPs, improves care as it allows physicians to get to the fun cool cases which I'd like to think is a big reason we all went in, to see cool stuff(jk). The PA kept going to the MD to make sure he was right, he could barely answer more then a few basic science questions I pretty much already knew the answer to. Include it certainly.