I argue that the feel of BotW is a return to Zelda origins. It's the most any game has felt like the original Zelda.
There original Zelda game was a game about exploring a giant over world to find it's secrets. The dungeons weren't puzzle filled, they were essentially just combat challenges.
... It's that feeling that you are setting out on a difficult journey of exploration across a giant world with no support.
Every Zelda game since the original has felt smaller in comparison because the role of the over world got shrunk to just a thing to connect dungeons.
My favorite is AlttP which I think has the best balance between dungeons and over world exploration, but I prefer over world to modern dungeons we got in skyward sword and such.
Aside from some fish which evolved with no eyes (which is kind of cool), the only other thing you are likely to find down there is a dead body that everyone decided was too dangerous to recover.