> - The landscape of transit cards is confusing, and while many of them are still accepted in various places, the existence of such a wide variety is mostly a legacy thing as far as I could tell. I had a Suica card and it worked virtually everywhere I went in Japan, though I didn't venture off the beaten path.

I think this is correct. I first went to Japan in 2008, and the cards you had actually mattered. I went again last year, and I used a Suica all over the country without problems -- it was a Suica I bought in 2008, and it still worked and had money on it after sitting in a drawer for 9 years.

It seems like all of these cards equivalent now, at least for tourists -- for people who live there, I think there are some differences in the kinds of monthly passes you can get for each card.