Abandon4093 said:
No one means aesthetic when they say Zelda hasn't changed. They mean the stories formula.
They are essentially all the same. Obviously not exactly the same, but it's more than just a few core elements.
Not really. While Ganon trying to obtain the Triforce and conquer Hyrule is the most common plot, it's only present in five of the fourteen games, and each of those five have something to make them stand out:
The Legend of Zelda is, of course, the original and has the most basic plot. Get Triforce, save Zelda. Classic.
In A Link to the Past, Ganon conquers Hyrule Heaven and turns it into Hyrule Hell. So there's a second world and even a secondary villain. And it introduces the Master Sword.
Ocarina of Time uses time travel to show a destroyed Hyrule that you failed to save. At its core, it's both a coming of age story and a hero's journey.
The Wind Waker completely floods the kingdom and you live in the pirate-filled ruins. Deals with a theme of past mistakes.
In Twilight Princess, Hyrule is being invaded by demons. Takes cues from Ocarina and Link, but does not repeat either of them.
These five games share the same three main characters (sort of), setting, and central plot device. They are similar stories. They are not "essentially the same".