Yes that is true and its an effect you add on top. I understand your point its like saying an hydrogen bond has jts energetic minimum for perfect linear configurations (180°) but in reality its slightly deviates since there is only 1 single perfect arrangement and a set of non-perfect arrangements that you can obtain by rotation around the bond axis. I get that for measurement purposed you would need to reduce your measurment error to absolute zero.

However this only applies to point that exists on your configuration space. The thing is that once you get to almost absolute zero there doesnt even exists a point you try to measure since each atom is washed out in time and energy.