Thanks for the link. That one’s a tough read. I find myself disagreeing with nearly all of it.
It’s a very logically twisted argument that ignores the elephant in the room… more people commute between Wake and Durham county than any other two counties in the state by a very large margin. It is impossible to use objective metrics to define the Triangle as two metro areas and not split all metro areas in the country into their constituent counties, so one has to use emotional appeals, as this paper does.
I live in Orange county and commute to the Durham/Wake border every day. It’s pretty common for me to spend days doing things in all three counties.
To top it off they list Raleigh-Durham-Cary as a multi-core metro area with several other multi-core metro areas which are still considered single MSAs (Minneapolis-St Paul and Dallas-Ft Worth for instance), though all the same non-arguments could apply to them.