[DustyPorViva]

There's a bit of a difference between designing an overworld for a single-player campaign and one for an online environment, and that's kind of the problem with Graal. In Zelda, you can design a world that opens up progressively as you play. Yet in an online game that can be a sort of a cripple on the actual online experience. Suddenly you're locking out the player from the majority of the other players, and a community is very important in an online game. Not to mention the fact that a single-player campaign as a beginning, middle and end... you typically want to avoid that sort of design online because you want players to come back.

I'm not saying it can't be done, but it takes a lot of effort and sometimes it pays to focus more on things that benefit an online experience rather than a single-player one. Not that that has ever stopped me from designing my overworlds with progression and exploration/questing in mind.