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zorg1000 said:
The main reason was to have a 3DS sku with Amiibo compatibility without needing an add on

The most correct answer.

But "all of the above" is also acceptable.

One thing we know for sure is that "improved 3D effect," one of the model's most noteworthy features, is not the reason, because Miyamoto convinced them to slap it on towards the end of its development.