About 2 1/2 years ago.
My interpretation is the procedures are aimed at having those who are remaining the circuit established at circuit height before you turn downwind. If you are not remaining in the circuit the procedures are aimed at keeping you clear of the circuit pattern.
Of course, the standard procedures do not work in every possible scenario, that is why they are recommended, it lets the pilot in command decide the safest course of action.
Same with the radio calls. If you can get the standard ones in great. If not just make the next one in the sequence, as opposed to the "I'm half way down on a wide left downwind, over Joe's house". Of course if you need to speak up do so "Tracking number 2 to ABC" etc.
Safe flying.
