It's not universally advantageous and I never said it was. I think you're missing my point. If someone is looking for a world city, there aren't very many in the US. I didn't say I am looking for them or that you should be looking for them. I am suggesting that the original commenter is looking for them and struggling to find them. My comment is simply that: a comment about how I'm surprised there aren't more world cities in the US.

The definition of a "world city" is arbitrary and pointless. No one cares.

You seem to care to the point of it trigging a defensive reaction on your part. I didn't know I was entering the hornets' nest. I had no idea this was a touchy topic for some people.