The article really dives into why the sandwiches are much better, tastier. Mind you I've lived within a block of fairly good Japanize food marts here that have very similar offerings (e.g. Nijiya Market) and would go there to get my fix every few weeks, but the quality and taste really wasn't the same (e.g. the rice wasn't as good and seemed day-old).
Really, everything in Japan had my 80's kid brain going nuts with joy. I didn't much like how prevant smoking was (nor getting kicked out of restaurants for not being Japanese), but I'll take the good with the bad (like anywhere). Absolutely amazing place.
One of my favorite parts of leaving japan is loading up on the sandwiches/rice balls at the airport - from the 7/11 vending machines in the seating area.. god I love that country.