I have to admit that consistency and clarity of thought are often not implied just by the choice of notation and have not seen many books and professors putting effort to emphasize on its importance or even introducing it formally. I've seen cases where people use fancy notation to document topics than how they think about it. It drives me nuts, because the way you tell the story, you hide a lot how you arrived there.

This is why I picked so well on the exposition by Terry Tao. It shows how much clarity of thought he has that he understands the importance of notation.