Originally Posted by BendtheBar
No, not necessarily. Could imply instability due to weakness, lack of balance, etc.
My point was that unless something funky is going on at the point of lockout, it is safer, or provides less direct stress on the joints than not locking out.
I read that people who only ever lift without lockout never place the skeletal system under enough stress to be able to keep up with the muscle's strength, so in a way, they hinder their own progress; whether it's true or not, I don't know, but it seems to make some sense. Taking Oly lifters, as an example, the end position of the snatch is deemed the strongest in the movement because the skeletal frame assists in the load bearing where the muscles alone could not do so.