It seems that in the classic era of golf design, many of the great architects seemed to have centers of activity. Flynn in Philadelphia, Florida and DC/Virginia, Tillinghast and Macdonald/Raynor in New York, Ross everywhere I guess but New England and the South, Thomas in California, etc. Work was seemingly advanced by word of mouth and visiting courses.
Today, travel is far more convenient and the internet and other outlets make everything today more visible. Do architects of today seem to have geographic holds on golf designs? It doesn't seem so and I'm trying to figure out why. Are today's projects more marketing driven and thus need differentiation whereas the clubs of the 1920s and 1930s didn't have the same need for differentiation?
Home bases certainly would be an exception. Davis Love's group in the Carolinas, etc.