Interesting. When you say practicing technique with little movement is ‘good in practice…’ I am assuming you mean it’s really not good. I’ve also seen a lot of technique demonstrated without any movement at all by either tori or uke. E.g. grab an arm, twist it, throw. The lack of movement means there is no energy involved. An attack is an attempt to aggressively transfer energy from me to you - often with a fist or a foot, thereby destabilizing you. Transferring that energy and defending against it requires movement - i.e. Get out of the way, maintain your stability, then to your point, seeing what becomes possible. Even when demonstrating the details of a grab, a wrist lock, etc, my sensei always started with a move that put me out of harms way, kept me balanced, and off balanced my opponent.

You would think that this would be obvious. But competition sometimes leads to things like trying to rush or grab the knife arm. The practice of exiting/avoiding is a good first thing to learn.