[cryptonector]

When I lived in Japan I was told there are over 1,000 counters, and that one's mastery of them is part of how people determine one's level of literacy. Perhaps only about 20 get used all the time. And certainly you can get away with using only the default counter (but you'll sound illiterate).

Romaji is also used on signs and other material aimed at foreigners -- Japanese people generally can read romaji because, after all, they are taught English in school. Romaji is not much of a cognitive burden, I agree, since it's very simple, goes along with English, and there's only one romanization.