Implementing Jumping through one-way platforms is easy.
Implementing Jumping through anything, no matter how deep, and detecting the first safe place for him to stand, as well as having the ability to back out at any time to return to your original position, especially in a huge open world game like this? I'd say it's pretty technically impressive. Especially how fast it loads when showing the little upwards swimming animation.
You can use this ability in the underground in some places to pop up anywhere on the overworld. From the bottom of the world to the highest mountain. It's way more impressive than just jumping through things.
> Many reviews (and myself!) find this addition to be cool but shallow? Also, while cool, its not technically mega avant garde here- "Banjo Kazooie nuts and bolts" attempted similar thing back in 2008.
I never said it was some unique thing no one has ever done before. But it's definitely not shallow, you only have to look for videos showing the crazy things people are building to see how it's mechanically super deep. I never played Banjo Kazooie but Im guessing it didn't have nearly the level of physics simulation, or the number of parts that are usable, or anywhere near the size of world that Zelda has. That's why it is technically impressive. Not just the mechanic, but the context that the mechanic is in.