This use case (use by people who are not literate) is one of those few circumstances where worse-is-better, because public toilets (like one might find in a train station or department store) are typically either mechanically operated (trivial to use) or the lowest-scale models.
That said, this is not a rare, exotic toilet in Japan; it's something which would be unremarkable in an office building or a restaurant that you could reasonably use for date night.
Don't you like the washiki toilets? ;) (seriously, I live neither in a big nor a small city, but there are way too many of them still, in this century)
I don't :-) But that's the reality of the izakayas around here. Actually the virtually brand new (7 years old???) onsen near me has exclusively washiki toilets (very nice new ones). Apparently the older patrons like them. They have handlebars on the wall too, which is a nice usability touch.
That said, this is not a rare, exotic toilet in Japan; it's something which would be unremarkable in an office building or a restaurant that you could reasonably use for date night.