Notice that Reese does not lean against a back braced bench. Pretty much straight up and down on his own. Gives excellent core strength to the lower back and abs (and obliques), which any type athlete depends on. Hand spacing , like to the clip, should allow about a 90 degree angle from the forearms to the upper arms. Mistake guy's make is a too wide or too narrow grip, putting extra stress on the shoulder joints. Thats where trouble may happen.
Actually the press behind the neck does strength the whole shoulder girdle to guard against rotor cuff injuries. Though that exercise is not always meant for everyone. Guy's who want to improve their bench might include the press behind the neck. Works for the PL'ers.