That's an uncharitable characterization, for sure. Though I do remember in my first graduate probability class, the instructor would often say something like "S

That's an uncharitable characterization, for sure. Though I do remember in my first graduate probability class, the instructor would often say something like "So what do we think the answer should be? Just change the order of integration like so and it falls out. If you're a physicist, you're done! Now we prove it."