So, I've noticed lately that many games, (Still) don't really utilize this ROUND earth methodology.
For instance in, Final Fantasy 7, you have a rectangular map in the lower right (or any FF really). Now, with your airship, If You fly 20 degrees west of the northpole, when you pass it, you should be 70 Degrees East of the West pole (or would you be 20 degrees west, I'm not sure how it works) Regardless, you wouldn't automatically end up at the south pole. That makes half the world be skipped. So obviously not a lot of RPG's have round earths when you freely explore. The one exception I've noticed to this is Star Ocean 2 with the Globe Map. Regardless, don't you think, we, the player are being cheated out of a true Round RPG world?