Earlier quoted context omitted.
I hope that you recognize that your casual-outsider evaluation of the assortments of these stores is deeply flawed and not based on actual data. If you think about it even just a little bit, you'll recognize that it wouldn't make sense for a supermarket in one of the highest median income cities in the country to have assortment parity with a chain targeting cost conscious shoppers. The devil here is in the long-tail…
Safeway is the cost conscious option in Mountain View, compare it with the other options (Whole Foods, Nijiya). The comparison between Publix and Safeway is apt.
https://www.sfgate.com/news/article/Whole-Foods-vs-Safeway-W...
Ranch 99 and the little De Martini's produce shop undercut Safeway prices on produce in Mountain View. The comparable items work out to be less expensive at Trader Joe's versus Safeway, too, last time I looked. Produce at Costco is regularly less than all of the above but I only buy a few produce items that I can freeze for later use there. For me the two advantages to Safeway are the extended hours of operation and the locations being convenient.