@snacks @Suiseiseki
cartriges are read-only, all updates and dlc get stored in system memory or SD cards.
For your first question I know that 64 GB is the top end in storage for retail copies, but there's also smaller ones.
For Switch 2 I got no idea, there's only 1 non-nintendo physical game anyway (at least even nintendoddlers don't seem to buy the decryption handshake cards and third parties are slowly getting the message). The SD Exress cards arguably are not that cheap, which probably contributed to the game-keycard scam