But the value of a unit of currency being unrelated to the currency's strength had nothing to do with whether that currency has cents or not. That comment just used the wrong explanation to make a correct point.

Also the map isn't entirely useless, because what it does illustrate is currencies which likely suffered from high or hyper-inflation in the past (or are very old). Obviously, no government first issues a currency and says "... and so one loaf of bread is 10000 schmeckles". That's just impractical.

Of course this doesn't mean that then Japanese Yen is a bad currency, but it does make for an interesting historical point.

This, I don't think the map is incorrect, for me it would be more interesting to compare people's wealth than the arbitrary value of a token