Not at all. Science isn't just about observation, it's also about predictive power. Once you run the experiment, whatever happens, happens, and you observe it

Not at all. Science isn't just about observation, it's also about predictive power. Once you run the experiment, whatever happens, happens, and you observe it and register it. But you don't want to do that. You want to come up with an answer beforehand -- I think this will happen because it lines up with what that model suggests should happen. Once you run the experiment, you know which direction it should go, but you still don't know why. Post-hoc explanations of why it rotated the way it did rob you of the chance of trying to come up with the answer yourself, so you can then find out if you were right.