It is meant to be disorientating. What would be the point of it if the clot (or whatever variant) simply held you in place? Yes, it would restrict movement, but it wouldn't nearly be as threatening as a clot (again, whatever variant) distracting you and forcing you to look away from whatever else you are concentrating on. And saying it is a "bad" mechanic is just not right. I believe that this system is great and gives clots a higher purpose and makes them more threatening instead of being just cannon-fodder.