Nintendo was always "on cart only" though. Like the games were actually complete, and didn't feel like they were "missing something", that DLC magically fixed. I just see this as a bad portent for Nintendo.
In this case, it's really just levels that have nothing to do with the story and are for fun. First 3 DLC levels give you characters from previous FEs to use if you want. Next few DLC levels are Gold farming, EXP farming, and some other sort of character growth enhancement. Detracts nothing from the game, and also doesn't add any BS. :)