I just quickly browsed through the lectures and this seems very consistent with Feynman style where there is a lot of text and very little math. From his book "surely you must be joking Mr. Feynman", he mentioned that fundamental understanding is largely is lacking in modern education. Instead, students go on and on about memorizing complex formulas that made no sense to them.
Maybe we're not all smart enough for this, but it does make sense that if we understand the problem well, then the calculation for it will be obvious.
Maybe we're not all smart enough for this, but it does make sense that if we understand the problem well, then the calculation for it will be obvious.