I also find it confusing. The only factor that makes any sense to me is that when two cities have esssentially grown into one they should be counted as one mass of population. I think they've split up the Bay Area and also LA into more than one metro even though they're both completely made up of cities and suburbs that have grown into a single giant city. I see no point in muddying the question with irrelevent facts about where people commute.
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"If this is a blessing, it is certainly very well disguised" Winston Churchill
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