Short stroking might not be perfect form, but the danger of injury (immediate and long term) is still much lower than in crossfit. Again that's because bodybuilders aren't doing them in power movements. Short stroking is done mostly on machines.
Personally I always feel I'm more susceptible to injury using full rom anyway. Also my joints don't like them as much. For me the occasional short stroking/pumping workout or exercise is still a useful tool for a gym rat.
My belief is not so much having to do with the range of motion being used but rather doing explosive movements. When you examine what happens when you, say, throw a 135 lb barbell overhead. At the beginning of the movement, the force on the muscle is way more than 135 lb and then for the rest of the movement momentum takes over. So if you believe muscle tension and contraction is a factor in developing muscle hypertrophy and strength then this is about the worse thing you can do. A huge force in the beginning of the movement and very little actual TUT for the rest of the movement. It's like the difference between pushing your fist as hard as you can on a solid wall and punching it as hard as you can. Acceleration versus velocity. You can sit on a plane going 500 MPH and be fine. Go from 0 to 10 MPH in a fraction of a second, or to make it easy, drive 10 MPH and slam on the brakes, and you feel like your body would be thrown into the air if you weren't belted in.
But I do agree that partials, "short-stroking", is easier on your body -- especially on the pushing movement. Full range movements, all the way to joint lockout, are causing constant grinding of the joints. Also, it's less productive, at least if you believe that continuous tension, TUT, matters.
