With an extra wide collar grip, the press behind the neck becomes more of an extension (out and away from the body) movement rather than a pure pressing one. Which in return places more pressure/leverage on the rotor cuff. Even more so if the bar is lowered near or below the nap of the neck or around ear level. With a grip slightly wider than shoulder it becomes more of a pressing movement, the original idea of the exercise. And in general terms, a safer exercise for most people.
Even with a normal shoulder width grip this exercise is not meant for everyone. Some do not take the time to warmup and stretch the shoulder girdle before preforming the movement. Plus lowering the bar too far down the back. Some guy's just aren't born with the bio mechanics (muscle insert or bone leverage placement, etc) to do this exercise with any serious intent. And they should not in most cases. If having no problems with the PBN, than enjoy the benefits of this mass builder, but with a regular grip. And do warmup.
Olympic lifters are much more flexible than BB'ers and are accustomed to using a heavier weight overhead. Though I don't recall ever seeing any lifter lower the bar much beyond the head range. Might be some, I don't know. For the most part, they are working on their overhead holding and pressing out strength from that position. Also front Jerk presses to help with the total overhead lockouts. Good Luck