This is a section that stood out to me in the Yates back piece that DeltaOne posted:
"In my early career, I experimented with various types of grips, and I found that using a closer grip with the hands either parallel (facing each other) or fully supinated (underhand) actually provided the best contraction and most complete range of motion for the lats. Throughout my Mr. Olympia reign, I never did a single set of wide-grip chins or lat pulldowns. My two choices for vertical pulling were always a narrow underhand grip for lat pulldowns, which I would go up to 400 pounds on, and the Hammer Strength Iso-lateral pulldown machine.
A final reason to consider using a narrow grip beyond the issue of range of motion is the fact that it puts the biceps in a stronger position. Since the biceps are far smaller and weaker than the lats, putting them in a position where they are guaranteed to fail before the lats are properly stimulated, as in any wide-grip vertical pull, will cause you to shortchange your potential growth."
Very interesting to read. It doesn't mention anything about wide grip being bad for shoulder health, rather that it's just bad for bodybuilding.