[chrismortimer66]

The muscles may not be designed to lift throug a full range, but as far as physical development[bodybuilding] or strength training, then excercising through a full range is needed.
Also you example of pickin up a pencil only works on a week person, you ask me to pick a pencil and a 30lbs dumbell straght after, you will see the same movement.

"That's an example that our subconscious already knows that we shouldn't use full range of joint motion for a lift with a Type II fiber, so why teach it?"
The body finds the easiest way to lift things, that doesn't mean its always the best i.e. picking up heavy boxes, so many people hurt themselves picking up heavy stuff, but they pick it the way thier body tells them.

You overcome biomechanical disadvantages by getting stronger, you do this by FORCING the body to ADAPT, to heavier weight by whatever strategy you wish, i.e. slow reps, fast reps, pre-exhaust, forced reps, half and quarter reps, negatives etc, in conjunction with strict form movements.

You will always hit a wall when training any range of movement, then its time to change the anount of rom your using.

Postural distortions will only occur if undertraining or overtraining of certain core muscles occurs.

The main point is your body doesn't to get strong and grow muscle, but you have to force it to. People who train with thier egos with half reps and cheat movents all the time, are allowing thier instinct to make it easier on themselves to dominate.
Injuries will be more likely to occur in these individuals as they wll have significant week links in thier muscles, which could prove to be hazardess in the gym or in real world situations, where they make choose to take on physical task, and because of thier type of training they have developed a false sense of thier strength ability and end up hurt or worse.