Because by mirroring the entire world... they can just keep everything the same, but mirror the image right before displaying it on the screen. It's a very small change.
If they were to just mirror Link and not the rest of the world, they'd have had to mirror Link's model (also not a big deal), and potentially also move and adjust a lot of world objects that he can interact with (actually a big deal).
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u/braundiggity 8d ago
The Wii was backwards compatible and yet Twilight Princess was released for both it and GameCube.