You seem to be stuck on square footage.
If I am required to have 5 circuits in a house, I can legally put four of them on two duplexes, and the fifth circuit to cover all the other outlets. I am not required anywhere in the Code to spread those circuits out per the square footage of the dwelling.
I would have to agree. Just because someon does it different, doesn't mean it's wrong.
The City of Los Angeles used to, and still may, require two circuits per bedroom, never said how you had to break it up, you could run two circuits through all the bedrooms.
It was getting really bad here for awhile, because guys would want to run a circuit to every outlet (insert sarcastic tone here) and fill up a panel with splits, then when the pool contractor came out there was no more room to add anything.
When guys talk about making money on a job or cutting cost and time, I believe that running home runs in residential is the most time/material consuming part of the job.