What I mean by taking the shoulders "out of their socket" is any action that results in the shoulders losing connection (popping out, acting independently, "separating", etc.) from a larger upper-body structure -- and by default, the whole-body structure. I was shown how this failure occurs and how to train to correct it. But hey, that's just poor ol' sucky me, I'm sure everybody else is awesome and doesn't do this at all so they can play around with their shoulders while keeping everything connected.
I don't know about you being sucky and all but I can move my shoulder and still be centered. The shoulder doesn't pop out it...it blends with the grab and helps direct into the throw.