I think that one factor is that in the Chinese culture, you don't expect everything to be good and available during all seasons. At a Whole Foods, you can reasonably be assured of asparagus in the winter time. In Chinatown, things are only available when they're in season, like a farmers' market. Also, if you've ever ordered at a Chinese restaurant with a Chinese family, you'll see this phenomenon. Instead of orderin…
I don't think that's a cultural thing, and certainly not an ethnic thing. I think it might have something to do with how many generations-removed one is from agrarian life (or close physical/logistical proximity to it)... Growing up in my (very white) hometown in New England, which still had plenty of farms at the time, it was well understood that the good produce was seasonal and not available in chain supermarkets.