Yeah, the numbers have been fudged several times throughout the game's history, and never really systematically validated against any kind of historical average beyond a vague sort of "yeah, that seems about right."
There was a thread a while back about the sizes of the continents, and the conclusion that I, at least, drew from it was that "Battlemasterra" is a planet undergoing an ice age, and the "continents" we know are all islands strung around the equator. (That was, at least in part, the inspiration for the Ice Age event, that didn't turn out nearly as well as I'd hoped.
)
