I definitely agree with what is said there. I especially like the comments about the interaction between intuition, and an understanding of the fundamental concepts. I have met a few people who claim that they don't need to understand fundamentals because they have intuition. Their "intuition" is actually limited to a few examples, memorized in detail. They can't extend the examples, or even see deeply into them.
One point that wasn't stressed is a need to know when you have reached the limits of your intuition. Simple examples and analogies eventually break - and that's when you have to go back and re-study all that higher-level stuff in detail.
Dale