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archer9234 said:

Because the main description to the features is to boost and enhance your fighter in smash. Basically upgrading and unlocking perks. That's done in the likes of DLC normally, since this is paid and not unattenable in the game.

The fighters grow on their own. You don't enhance them with Amiibo. You store their data in your Amiibo. There's no upgrading or perks here, each Amiibo is a CPU-controlled fighter that you can carry around as a figure so it's not isolated to one system/save file.