When I said Zelda: Wind Waker was borrowing from RPGs, here's what I was referring to:
"The biggest real change, and it is a drastic one, is that Kaze no Takuto has taken on a stronger RPG design than any of its predecessors. While battles are still real-time and there are no experience points or “leveling up”, the story takes a far more prominent role than Zelda fans are used to. It’s not that the game’s design has been compromised to account for more plot, but rather that the same amount of story progression always infused into the series is now much more effective. To put it bluntly, the story is great. It’s creative, motivating, and unpredictable. It looks at the Zelda mythos from an entirely new perspective, and longtime fans of the series will be delighted to see a new take on the legend."
"The other RPG-like difference is the overworld. ... Link and his boat have an unbelievably huge world to traverse, and travel becomes a major new theme for the game. For the most part, it works wonders. The sea is literally full of things to do, monsters to defeat, and places to explore. If your favorite part of Final Fantasy games is exploring the overworld for secret places, you will have many, many hours of fun in Zelda’s nautical landscapes."
Source: Planet GameCube:
http://www.planetgamecube.com/reviews.cfm?action=profile&id=264So basically, the new Zelda is borrowing the ideas of a detailed, in-depth story and sidequests from already-existing RPGs.