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Cash is not one of those things though. Nor is the system of buying metro tickets with cash only and without an option to change language.

Metro tickets with cash only seem fine to me. What is your problem with that?

I believe inside of Tokyo almost all the machines also support a variety of languages now, but there might be a scattered few with only Japanese.

I just left Osaka yesterday. I didn't use every machine, but I never found one that didn't support English.

There is a big "English" option. Plus other languages as well.

I might have been unlucky then, but the one machine I was in contact with before I ceded all responsibility on my host was Japanese only.