Game-key cards are different from regular game cards, because they don’t contain the full game data. Instead, the game-key card is your “key” to downloading the full game to your system via the internet.
Pay a premium for a physical copy of your game, and the cartridge may not contain the actual game. Only on Nintendo Switch 2.
Ceremony can be a PITA,.no argument here.
But I would be shocked if Nintendo made a digital “eject” erase anything on the local console.
Yeah, it would be insane if the game’s also uninstalled, but that second system still needs to be at hand or someone needs to “eject” it. It’s a really dumb system.