MapleStory 2, welcome.

Whats the point of setting this world at leasT 500 years before the current MS' time if you're just gona reuse the same geography?

Uh. That's still a ridiculous question.
The point of being in a different time is to be in a different time, not a different geography.
TESO is hundreds of years before the other Elder Scrolls games but it's still the same geography. The difference is what's happening at the time and who is involved and what they're capable of. Place is place. Unless the maple world had some massive catacylsm that reshaped all the geography the time, especially less than a thousand years, certainly wouldn't change that much.