1.) for many of the ethnicities, california usually has the largest immigrant communities, outside of the native country. Therefore the dishes can be much more authentic and cater to the native crowds. As opposed to a Greek restaurant in Tokyo, or a Thai restaurant in Paris. When I lived in Japan I often missed my Vietnamese pho. And when i lives in Paris I often craved for my Mexican burrito.
2.) it doesn’t have any food history, and therefore no codified rules on how and what cuisines should be ( as opposed to French cuisine, like mentioned in the article ). Therefore we have Californian sushi, Korean tacos, Japanese pastas, Korean hot dogs, and so on. Fusion and innovation is alive and well
3.) fifth largest economy in the world that helps to support diverse and vibrant restaurants, farms and foodies
4.) real focus on vegan cuisines. If you were a vegan you would be blessed to live in la or sf. You would be able to not just be able to get vegan but also Vietnamese vegan, Thai vegan, American vegan or Japanese vegan cuisines. If you tried backpacking through Asia or Europe as a vegan you would know how hard that is.
Michelin guide recently released a California guide and California is now on the map as a foodie destination. Even though it only has 90 Michelin restaurants as opposed to Japan’s 230, I have way more fun dining in la or sf than Tokyo due to the diverse ness and casualness of the cuisines. (But Tokyo will always have a place in my heart on how perfectly executed a single ingredient/dish could be)