Speaking from experience I was recently in a tiny fountain pen shop in Sendai[0] where the owner doesn’t speak English and I don’t speak Japanese but we were able to talk for an hour or more about fountain pens and tomoe river paper alternatives using Google translate’s dialogue feature.

Maybe not massive commercial potential but it was pretty amazing and reminded me a bit of the Babel fish which use to seem like impossible sci-fi

[0]: https://share.google/64xTBRThXcFR72r3G