I think you're confusing Switch and 3DS. They changed the Switch so that most games can be cloud-saved, and it'll automatically copy your saves if you have two systems with the same games on them. Game licenses also carry with you if you're online with multiple systems, and the offline half of the license can be remotely revoked and transferred.
Animal Crossing and Pokemon are outliers. The former has a backup system that only can be used if you call Nintendo customer support. If you plan your transfer ahead of time you can do it yourself, 3DS-style, but it took them multiple updates to implement that. (Part of this is because the island is owned by the system, not individual users, which is an odd design choice.) I have no idea how Game Freak expects you to keep your Pokemon saves safe.
Animal Crossing and Pokemon are outliers. The former has a backup system that only can be used if you call Nintendo customer support. If you plan your transfer ahead of time you can do it yourself, 3DS-style, but it took them multiple updates to implement that. (Part of this is because the island is owned by the system, not individual users, which is an odd design choice.) I have no idea how Game Freak expects you to keep your Pokemon saves safe.