It's more than cosmetic in these games -- there are entire realms accessible only if you have the right Amiibos or combinations thereof.

So really more like the Pro vs. Home metaphor with the code for both being on the disc you bought.

This doesn't help answer the debate directly, but is relevant to understanding the question.

That's fair, but my point was more than the consequences of hacking a database with information valuable in the real world are much more worrisome than cheating in a game (no matter how much it affects the artificial world). In the latter, it's debatable about whether it causes real-world harm; in the former, it's unquestionable.

The question is, are those realms being sold as part of the game or part of the Amiibo? Where the code and assets are stored is, after all, an implementation detail.

That matters more for the Skylanders games... outfits and special equipment in Breath of the Wild are mostly cosmetic.