I'm pretty sure I'm not going to change your mind on this, but:
Los Angeles alone accounts for 20 million, about half of California's population. As I showed with the
figures here, the other four big cities on the Pacific coast are roughly equal -- San Francisco is slightly large than Seattle, but not by much. And that's reflected in the fact that San Francisco gets basically its entire BFC to itself, while even in my expanded map, Seattle's bottom two rows overlap with Portland, and its top two rows overlap with Vancouver.
That's because the
Robinson projection has a heavily distorted shape around the east-west edges of the map, order to minimize the north-south distortion of
Mercator.
National Geographic uses the
Winkel-Tripel projection, which has the same distortion (turning straight north-south lines into a wide curve). I own one of their
Pacific-centered world map, which uses the same Winkel-Triple projection, but focuses on the Pacific rather than the Atlantic Ocean. Because the new center puts the Pacific Northwest (barely) further from the edge of the map, there's much less of a curve. Basically: the Pacific coastline of the US almost perfectly follows a straight north-south longitude line, as can be seen in the Mercator map.
Pretty much the only other region of our new map that follows the Robinson projection is Japan, with its rounded western coast. Yet we've all seen how much of a nightmare it was to figure out the shape of Japan, and that conversation largely focused on how to fit the key cities of the Japanese civ.