An extreme example to illustrate.
Let's say we have a valid question about Antartica versus the same question about New York:
Antartica: bigger than a country, so it doesn't fall under loo lozalized, but I doubt there are many programmers there besides a few researchers
New York: has a very high population density and a lot of programmers, but falls under the "too localized" rule because it's smaller than a country.
Hence I suggest that "too localized" would be more accurate if it used the size of the target population instead of arbitrary geographical areas.