I think this is true--it gets students used to the fact that physics is complicated enough that you will never be able to understand it if you try to derive every detail in a step by step proof. You have to learn to skip steps sometimes and reason by analogy, and trust that the work others have done in working out the details is sound. One of the hardest parts of physics is trying to know when you should be suspicious that some step was done in too cavalier a way, and when you should not bother verifying every step. You just have to develop a knack for spotting which kinds of handwaving holds up and which kind falls apart under scrutiny.